The purpose of this study was to assess the efficacy of the insulin tolerance test (ITT) in predicting the effectiveness of insulin sensitizers in type 2 diabetic patients.
Methods
We retrospectively reviewed 360 consecutive patients with type 2 diabetes admitted to Osaka University Hospital, Japan. In 163 of these hospitalized patients, insulin resistance was evaluated by the ITT after their blood glucose level was ameliorated. We then analyzed the association between their clinical characteristics and their glycemic control 6 months after discharge.
Results
The rate constant for plasma glucose disappearance, KITT, was negatively correlated with body mass index (BMI), waist circumference (WC), and visceral fat area (VFA). The median value of KITT was 1.56 (%/min). In the KITT > 1.56 group (n=81), hemoglobin A1c (HbA1c) significantly increased in both patients treated with insulin sensitizers (n=10) and patients not treated with insulin sensitizers (n=71). In the KITT ≤1.56 group (n=82), HbA1c significantly increased in patients not treated with insulin sensitizers (n=60); however, it was maintained well in the patients treated with insulin sensitizers (n=22). When the patients were divided and analyzed according to the median values of BMI, WC, or VFA, the glycemic control change was not different between the two groups with insulin sensitizers for each parameter.
Conclusion
Insulin sensitizers were effective in type 2 diabetic patients with high insulin resistance estimated by the ITT. The ITT could be useful to predict the effectiveness of insulin sensitizers.
Hinweise
This article is published with open access at Springerlink.com
Introduction
Type 2 diabetes mellitus is characterized by decreased insulin secretion and insulin sensitivity in varying degrees.1‐4 In Japanese diabetic patients, impaired insulin secretion is emphasized rather than insulin resistance,5 but insulin resistance also plays an important role in the deterioration of glucose tolerance.6,7 Recent studies have shown that the homeostasis model assessment of insulin resistance (HOMA-IR) in Japanese patients with type 2 diabetes was significantly higher than that for subjects with normal glucose tolerance.7,8 The prevalence of metabolic syndrome (MetS), which is characterized by insulin resistance9 defined by the criteria proposed by a Japanese study group,10 has reached as much as 45.9% in male and 28.0% in female Japanese type 2 diabetic patients.11 Therefore, it is important to consider insulin sensitizers in treating Japanese type 2 diabetics as well as insulin secretagogues. Insulin sensitizers, such as pioglitazone and metformin, are available, and are expected to improve glycemic control in patients with insulin resistance. However, it has not yet been fully clarified which characteristics in diabetic patients determine the efficiency of insulin sensitizers in each patient.
The euglycemic hyperinsulinemic clamp is regarded as the gold standard technique for measurement of in-vivo insulin action,12 but it requires sophisticated equipment, several hours of work, and considerable expense to use. By contrast, the insulin tolerance test (ITT) is simpler, easy to perform, and a more practical method than the clamp. The glucose disappearance rate calculated from the ITT (KITT) has a close correlation with glucose clamp studies.13‐15 We hypothesized that we could predict the effectiveness of insulin sensitizers in patients using the results of the ITT. In this study, we retrospectively reviewed consecutive subjects with type 2 diabetes mellitus admitted to Osaka University Hospital, Japan, whose insulin resistance had been evaluated by the ITT. We analyzed the association between the effectiveness of insulin sensitizers and KITT in these patients.
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Materials and Methods
Patients
We retrospectively reviewed 360 consecutive subjects with type 2 diabetes mellitus admitted to Osaka University Hospital from 2001 to 2008. Following admission, all of the patients were treated by diet alone or diet plus insulin for at least 2 weeks, until fasting plasma glucose (FPG) was below 7.0 mmol/L. After FPG reached the target level, insulin resistance was evaluated by the ITT, and 32 patients among them were treated with insulin sensitizers, according to the judgment of physicians. Then, we retrospectively analyzed the clinical characteristics and the glycemic control 6 months after discharge.
Measurements
The ITT was performed after an overnight fast, as previously described.13 Blood samples were collected every 3 minutes for 15 minutes after intravenous regular insulin injection (0.1 U/kg). The plasma glucose half-time (t½) was calculated from the slope of the least square analysis of the plasma glucose concentrations from 3 to 15 minutes after insulin injection. KITT was calculated with the formula 0.693/t½.
A 75 g oral glucose tolerance test and a glucagon stimulation test were performed, as previously described.16 Plasma glucose concentrations were measured by the glucose oxidase method, and immunoreactive insulin and C-peptide levels were measured with enzyme immunoassay kits. For evaluation of glycemic control, the values of hemoglobin A1c (HbA1c) at the time of discharge (or within 1 month after discharge) and 6 months after discharge and the increments of HbA1c (ΔHbA1c) between the two periods were used. The value for HbA1c (%) is estimated as a National Glycohemoglobin Standardization Program (NGSP) equivalent value (%) calculated by the formula HbA1c (%)=HbA1c (Japan Diabetes Society [JDS], %)+ 0.4%, considering the relational expression of HbA1c (JDS, %) measured by the previous Japanese standard substance and measurement methods and HbA1c (NGSP).17 Plasma adiponectin levels were determined with an adiponectin enzyme-linked immunosorbent assay (ELISA) kit (Otsuka Pharmaceutical Co. Ltd, Tokushima, Japan), as previously described.18 The visceral fat area (VFA) was estimated by computed tomography, or by abdominal bioelectrical impedance analysis, which was shown to correlate significantly with VFA determined by computed tomography.19
Statistical Analyses
Data are presented as the mean±standard deviation (SD). Comparison of variables between groups was done with the Mann-Whitney nonparametric test, or an unpaired Student’s t test. Pearson’s correlation coefficient analysis was used to assess the cross-sectional relationships between KITT and other variables. Comparison of HbA1c at the time of discharge (or within 1 month after discharge) and 6 months after discharge in each group was done with a paired Student’s t test.
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Results
Insulin Tolerance Test
The ITT was performed in 163 out of 360 patients. The KITT of these patients ranged from 0.39%/min to 8.9%/min, and the median value was 1.56%/min. The body mass index (BMI), waist circumference (WC), and VFA were negatively correlated with KITT (r=-0.15, P=0.05; r=-0.25, P=0.003; and r=-0.23, P=0.02, respectively) (Table 1).
Table 1
Correlation coefficients of relationships between
KITT and various parameters in type 2 diabetic patients
r
Pvalue
Age, years
-0.06
0.43
Body mass index, kg/m2
-0.15
0.05
Waist circumference, cm
-0.25
0.003
Visceral fat area, cm2
-0.23
0.02
HbA1c, (%)*
-0.05
0.53
Fasting plasma glucose, mmol/L†
-0.05
0.53
HbA1c, %†
-0.04
0.62
Urine C-peptide, nmol/day
0.09
0.26
Insulinogenic index, pmol/mmol
0.03
0.69
Δ-peptide, nmol/L
0.09
0.31
Adiponectin, μg/mL
0.05
0.61
* Value on admission.
† Value at the time of discharge or within 1 month after discharge.
HbA1c=hemoglobin A1c; KITT=rate constant for plasma glucose disappearance calculated from the insulin tolerance test; r=Pearson’s correlation coefficient.
Patient Groups
The patients were divided into two groups according to the median value of KITT: KITT ≤1.56 and KITT >1.56. Each of these two groups of patients were further divided into two subgroups according to treatment with or without insulin sensitizers at discharge. Insulin sensitizer treatment was with thiazolidinedione (pioglitazone) (TZD), biguanide (metformin or buformine) (BG), or both (TZD+BG). The KITT ≤1.56 group (n=82) included 22 patients treated with insulin sensitizers (TZD, n=9; BG, n=10; TZD+BG, n=3). The KITT >1.56 group (n=81) included 10 patients treated with insulin sensitizers (TZD, n=3; BG, n=7). Clinical data from these groups were investigated 6 months after discharge (Figure 1).
Figure 1
Management protocol for type 2 diabetic patients. After hospitalization, patients were treated until fasting plasma glucose (FPG) was below 7.00 mmol/L. The insulin tolerance test (ITT) was performed in 163 of the patients to evaluate insulin resistance. According to the median value of the rate constant for plasma glucose disappearance calculated from the insulin tolerance test (KITT; 1.56%/min), the patients were divided into two groups: KITT ≤1.56 and KITT >1.56. These two groups were further divided into two subgroups: with or without insulin sensitizers at discharge. Insulin sensitizers were thiazolidinedione (pioglitazone) (TZD) and/or biguanide (metformin or buformine) (BG). Patient hemoglobin A1c (HbA1c) levels were evaluated at the time of discharge (or within 1 month after discharge) and 6 months later.
×
Clinical Characteristics of the Patients
The clinical characteristics of the patients of the KITT ≤1.56 group and the KITT >1.56 group are shown in Table 2. VFA was significantly greater in the KITT ≤1.56 group, compared with the KITT >1.56 group (P<0.05). Other parameters were not significantly different between the two groups. The number of patients using insulin at discharge was 45 in the KITT ≤1.56 group and 26 in the KITT >1.56 group, and patients with insulin secretagogues numbered 38 and 40, respectively. The clinical characteristics of the groups with and without insulin sensitizers in the KITT ≤1.56 group and the KITT >1.56 group are shown in Table 3. There was no significant difference in the characteristics, including markers of insulin secretion and resistance, between the KITT ≤1.56 group with insulin sensitizers, and the KITT ≤1.56 group without insulin sensitizers, as well as between the KITT >1.56 group with insulin sensitizers, and the KITT >1.56 group without insulin sensitizers. In the KITT ≤1.56 group, the number of patients using insulin at discharge was three (14%) in the group with insulin sensitizers, and 42 (70%) in the group without insulin sensitizers. In the KITT >1.56 group, the number of patients using insulin at discharge was two (20%) in the group with insulin sensitizers, and 24 (34%) in the group without insulin sensitizers. In two groups with insulin sensitizers, the number of patients using treatment other than insulin sensitizers at discharge was 17 (77.3%) for KITT ≤1.56 and seven (70%) for KITT >1.56. In the KITT ≤1.56 group with insulin sensitizers, mean dosage of insulin sensitizers at the time of discharge was 23 (15–30) mg/day for pioglitazone, 750 (all 750) mg/day for metformin, and 112 (100–150) mg/day for buformine. In this group, mean dosage of insulin sensitizers 6 months after discharge was 25 (15–30) mg/day for pioglitazone, 718 (500–750) mg/day for metformin, and 110 (100–150) mg/day for buformine. In the KITT >1.56 group with insulin sensitizers, mean dosage of insulin sensitizers at the time of discharge was 20 (15–30) mg/day for pioglitazone, 625 (500–750) mg/day for metformin, and 117 (100–150) mg/day for buformine. In this group, mean dosage of insulin sensitizers 6 months after discharge was 20 (15–30) mg/day for pioglitazone, 583 (500–750) mg/day for metformin, and 125 (100–150) mg/day for buformine.
Table 2
Clinical characteristics of the study subjects (total: KITT ≤1.56 and KITT >1.56)
Total
KITT≤1.56
KITT>1.56
n (male/female)
163 (84/79)
82 (44/38)
81 (40/41)
Age, years
60.1±11.9
60.1±11.5
60.4±11.8
Body mass index, kg/m2
23.9±4.2
24.5±4.7
23.3±3.7
Waist circumference, cm
89.6±12.0 (n=141)
92.3±12.6* (n=72)
86.9±10.7 (n=69)
Visceral fat area, cm2
108.6±52.9 (n=106)
121.0±54.4* (n=52)
96.7±48.9 (n=54)
HbA1c, %†
9.67±1.86
9.82±1.66 (n=81)
9.63±1.77
Fasting plasma glucose, mmol/L‡
6.33±0.99
6.44±0.90
6.29±0.86
HbA1c, %‡
7.13±0.90
7.22±0.87
7.04±0.92
KITT, %/min
1.9±1.2
1.1±0.3**
2.7±1.3
Urine C-peptide, nmol/day
21.5±14.6 (n=149)
20.3±14.5 (n=76)
22.8±14.7 (n=73)
ΔC-peptide, nmol/L
0.72±0.41 (n=130)
0.68±0.42 (n=65)
0.75±0.39 (n=65)
Insulinogenic index, pmol/mmol
9.78±11.9 (n=141)
9.41±11.3 (n=69)
10.1±12.6 (n=72)
LDL-C, mmol/L
2.90±0.68 (n=162)
2.77±0.66*
3.04±0.68 (n=80)
HDL-C, mmol/L
1.26±0.36 (n=162)
1.22±0.34
1.30±0.38 (n=80)
TG, mmol/L
1.15±0.52 (n=162)
1.17±0.49
1.14±0.55 (n=80)
eGFR, mL/min/1.73 m2
87.7±25.7
89.5±28.6
85.8±22.3
Adiponectin, μg/mL
5.4±3.3 (n=121)
4.9±2.5 (n=57)
5.8±3.8 (n=64)
Data are mean±SD.
*P<0.05.
**P<0.0001; KITT≤1.56 versus KITT>1.56.
†Value on admission.
‡Value at the time of discharge or within 1 month after discharge.
eGFR=estimated glomerular filtration rate; HbA1c=hemoglobin A1c; HDL-C=high-density lipoprotein cholesterol; KITT=rate constant for plasma glucose disappearance calculated from the insulin tolerance test; LDL-C=low-density lipoprotein cholesterol; TG=triglyceride.
Table 3
Clinical characteristics of the study subjects with and without insulin sensitizers (KITT≤1.56 and KITT>1.56).
KITT ≤1.56
KITT >1.56
TZD or BG (+)
TZD or BG (–)
TZD or BG (+)
TZD or BG (–)
n (male/female)
22 (12/10)
60 (32/28)
10 (8/2)
71 (32/39)
Age, years
59.9±11.9
60.2±11.4
62.7±14.3
60.1±11.5
Body mass index, kg/m2
24.4±2.7
24.5±5.2
24.2±2.1
23.2±5.8
Waist circumference, cm
91.7±9.3 (n=19)
92.5±13.7 (n=53)
91.5±7.8 (n=9)
86.2±11.0 (n=60)
Visceral fat area, cm2
118.7±43.5 (n=16)
122.1±59.2 (n=36)
115.2±52.1 (n=6)
94.4±48.6 (n=48)
HbA1c, %†
9.4±1.8 (n=21)
10.0±1.6
9.5±2.2
9.6±1.7
Fasting plasma glucose, mmol/L‡
6.43±0.91
6.35±1.17
6.26±0.82
6.29±0.87
HbA1c, %‡
7.1±0.9
7.3±0.9
6.6±0.8
7.1±0.9
KITT, %/min
1.2±0.3
1.1±0.3
2.2±0.8
2.8±1.3
Urine C-peptide, nmol/day
20.2±14.8 (n=19)
20.3±14.6 (n=57)
24.9±12.8 (n=8)
22.6±15.0 (n=65)
ΔC-peptide, nmol/L
0.82±0.41 (n=14)
0.65±0.42 (n=51)
0.87±0.56 (n=5)
0.74±0.38 (n=60)
Insulinogenic index, pmol/mmol
11.0±11.8 (n=19)
8.8±11.1 (n=50)
12.4±8.2 (n=8)
9.9±13.1 (n=64)
LDL-C, mmol/L
2.89±0.76
2.73±0.63
2.91±0.44
3.05±0.70 (n=70)
HDL-C, mmol/L
1.10±0.31*
1.26±0.34
1.26±0.33
1.31±0.39 (n=70)
TG, mmol/L
1.21±0.41
1.15±0.52
1.26±0.45
1.12±0.56 (n=70)
eGFR, ml/min/1.73m2
85.1±22.9
91.1±30.4
84.2±21.7
86.0±22.5
Adiponectin, μg/mL
4.8±2.2 (n=11)
4.9±2.6 (n=46)
5.6±2.1 (n=6)
5.8±4.0 (n=58)
Data are mean±SD.
*P<0.05, KITT ≤1.56, TZD or BG (+) versus KITT ≤1.56, TZD or BG (–).
†Value on admission.
‡Value at the time of discharge or within 1 month after discharge.
BG=biguanide (metformin or buformine); eGFR=estimated glomerular filtration rate; HbA1c=hemoglobin A1c; HDL-C=high-density lipoprotein cholesterol; KITT=rate constant for plasma glucose disappearance calculated from the insulin tolerance test; LDL-C=low-density lipoprotein cholesterol; TG=triglyceride; TZD=thiazolidinedione (pioglitazone).
Glycemic Control After Discharge
Glycemic control around the time of discharge and 6 months after discharge are shown in Table 4. The levels of HbA1c significantly increased in the KITT ≤1.56 group without insulin sensitizers (7.3%±0.9% to 8.0%±1.7%, P=0.007), the KITT >1.56 group with insulin sensitizers (6.6%±0.8% to 7.3%±1.1%, P=0.025), and the KITT >1.56 group without insulin sensitizers (7.1%±0.9% to 7.4%±1.5%, P=0.022). However, HbA1c did not increase in the KITT ≤1.56 group with insulin sensitizers (7.1%±0.9% to 7.0%±0.9%, P=not significant [NS]) (Table 4). In the KITT ≤1.56 group without insulin sensitizers, the ΔHbA1c (0.7%±1.6%) was higher than that in the KITT ≤1.56 group with insulin sensitizers (-0.1%±1.3%), but the difference was NS (P=0.087). Respective HbA1c changes in these subgroups are shown in Figure 2.
Table 4
Glycemic control after discharge in all of the patients
At discharge*
After discharge† (%)
ΔHbA1c (%)
Pvalue (%)
KITT ≤1.56, %/min
TZD or BG (+) (n=22)
7.1±0.9
7.0±0.9
–0.1±1.3
NS
TZD or BG (–) (n=60)
7.3±0.9
8.0±1.7
0.7±1.6
0.0007
KITT >1.56, %/min
TZD or BG (+) (n=10)
6.6±0.8
7.3±1.1
0.7±0.9
0.025
TZD or BG (–) (n=71)
7.1±0.9
7.4±1.5
0.3±1.2
0.022
BMI ≥23.2, kg/m2
TZD or BG (+) (n=18)
6.9±1.0
7.0±1.1
0.1±1.5
NS
TZD or BG (–) (n=64)
7.3±0.9
7.9±1.9
0.6±1.8
0.014
BMI <23.2, kg/m2
TZD or BG (+) (n=14)
7.0±0.8
7.3±0.8
0.3±0.9
NS
TZD or BG (–) (n=67)
7.1±0.8
7.5±1.4
0.5±1.0
0.0001
WC ≥90.5, cm
TZD or BG (+) (n=16)
6.8±1.0
6.9±1.1
0.1±1.5
NS
TZD or BG (–) (n=55)
7.3±1.0
8.0±2.0
0.6±1.8
0.013
WC <90.5, cm
TZD or BG (+) (n=12)
7.0±0.8
7.4±0.7
0.3±0.9
NS
TZD or BG (–) (n=58)
7.0±0.9
7.4±1.2
0.4±0.9
0.001
VFA ≥104.9, cm2
TZD or BG (+) (n=13)
7.1±1.0
7.2±1.0
0.1±1.7
NS
TZD or BG (–) (n=40)
7.4±0.9
8.1±2.0
0.6±1.8
0.032
VFA <104.9, cm2
TZD or BG (+) (n=9)
6.9±1.0
7.0±0.9
0.1±1.1
NS
TZD or BG (–) (n=44)
7.0±0.9
7.4±1.3
0.4±1.0
0.027
Data are mean±SD.
*At the time of discharge or within 1 month after discharge.
†At 6 months after discharge; ΔHbA1c was calculated from HbA1c 6 months after discharge minus that at the time of discharge or within 1 month after discharge.
BG=biguanide (metformin or buformine); BMI=body mass index; HbA1c=hemoglobin A1c; KITT=rate constant for plasma glucose disappearance calculated from the insulin tolerance test; NS=not significant; TZD=thiazolidinedione (pioglitazone); VFA=visceral fat area; WC=waist circumference.
Figure 2
Glycemic control after discharge. Glycemic control around the time of discharge and 6 months after discharge are shown. The levels of hemoglobin A1c (HbA1c) significantly increased in the rate constant for plasma glucose disappearance calculated from the insulin tolerance test (KITT) ≤1.56 without insulin sensitizers group, the KITT >1.56 with insulin sensitizers group and the KITT >1.56 without insulin sensitizers group. However, HbA1c did not increase in the KITT ≤1.56 with insulin sensitizers group. BG=biguanide (metformin or buformine); NS=not significant; TZD=thiazolidinediones (pioglitazone).
×
When all of the patients were divided into two groups according to the median value of BMI (BMI ≥23.2, BMI <23.2), WC (WC ≥90.5, WC <90.5), or VFA (VFA ≥104.9, VFA <104.9), the levels of HbA1c did not change in both groups with insulin sensitizers (Table 4). When they were divided into two groups according to the values based on the obesity or abdominal obesity criteria of BMI (BMI ≥25, BMI <25), WC (WC ≥85 in men and WC ≥90 in women, WC <85 in men and WC <90 in women), or VFA (VFA ≥100, VFA <100) in Japan, the results were the same as above (data not shown).
Discussion
In this study, we have shown the possible usefulness of ITT for selecting patients for whom insulin sensitizers are effective for glycemic control. With insulin sensitizers, the glycemic control worsened in the group with a higher value of KITT, but was maintained well in the group with a lower value of KITT. There was also a tendency to keep good glycemic control after discharge with insulin sensitizers in the latter group, compared with in the former group. By contrast, the other parameters studied (BMI, WC, and VFA) were not useful for determining the effectiveness of insulin sensitizers. In previous reports, rosiglitazone, which is one of the TZDs, and metformin were effective for glycemic control of type 2 diabetic patients with and without obesity, defined by BMI.20,21 These results, in addition to ours, suggest that parameters other than KITT could not clearly discriminate the patients regarding the effectiveness of insulin sensitizers. It is speculated that KITT represents in-vivo insulin action in the whole body directly,13 while other parameters do not, though these parameters are regarded as the factors associated with insulin resistance. In our study, BMI, WC, and VFA had low correlation coefficients with KITT. In other previous reports, BMI and waist-to-hip ratio were not related to insulin resistance estimated by KITT.22 These results suggest that BMI, WC, and VFA may cause or reflect some partial aspects of insulin resistance.
In this study, we evaluated patients’ insulin resistance after hyperglycemia was ameliorated. Defects in insulin action were induced only after 24 hours of hyperglycemia in patients with type 1 diabetes.23 Insulin treatment for 4 weeks and good glycemic control improved insulin resistance in patients with uncontrolled type 2 diabetes.24 Those studies indicated that hyperglycemia worsens insulin resistance, and that this augmented resistance could be recovered after glycemic control was improved. Therefore, we propose that the evaluation of insulin resistance should be performed after the amelioration of glycemic control.
In this study, we also analyzed the association between the effectiveness of insulin sensitizers and HOMA-IR, which was regarded as the reference parameter in cases with insulin therapy. When all of the patients were divided into two groups according to the median value of HOMA-IR (HOMA-IR ≥1.75, HOMA-IR <1.75), the levels of HbA1c did not change in both groups with insulin sensitizers, indicating that HOMA-IR was not also useful for determining the effectiveness of insulin sensitizers. HOMA-IR represents an index of the hepatic insulin sensitivity in the basal state,25 which does not necessarily parallel peripheral insulin sensitivity,26 while KITT represents in-vivo insulin action in the whole body directly.13 Indeed, the association between insulin resistance obtained from the homeostasis model assessment and the ITT was significant but quite low,27 suggesting that these two parameters represent different aspects of the insulin resistance.
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There are some study limitations to consider. First, this is a retrospective study, and we could not discriminate the effect of any medication other than insulin sensitizers, especially insulin, on glycemic control after discharge. However, the ratio of patients using insulin in the KITT ≤1.56 group with insulin sensitizers was not higher than those of other groups. Similarly, the ratio of patients using treatment other than insulin sensitizers was the same as that in the KITT >1.56 group with insulin sensitizers. Therefore, the good glycemic control obtained in the KITT ≤1.56 group with insulin sensitizers might be derived from the higher insulin resistance estimated by ITT, and the efficacy of insulin sensitizers. Also, patients with insulin sensitizers were not selected at random. The numbers of patients with insulin sensitizers in the KITT ≤1.56 and the KITT >1.56 groups are different and small. However, our data showed the significant difference of the effectiveness of insulin sensitizers among these subgroups.
Conclusion
In summary, insulin sensitizers were more effective for glycemic control in type 2 diabetic patients with higher insulin resistance estimated by the ITT. The ITT could be useful for predicting the effectiveness of insulin sensitizers. Further prospective studies are needed to confirm the usefulness of the ITT.
Acknowledgments
The authors declare no financial support or relationship that may pose a conflict of interest. We thank T. Funahashi, M. Moriwaki, T. Nammo, K. Kishida, H. Nishizawa, M. Kumada, S. Uno, K. Fukui, A. Hiuge, Y. Imamura, A. Katada, N. Komura, K. Sayama, Y. Tokui, I. Hayashi, K. Fujita, S. Kashine, Y. Kuroda, H. Shoda, S. Umemura, Y. Okamoto, S. Tamba, A. Tokunaga, S. Nakata, A. Hirata, E. Fukuda-Akita, K. Saisho, Y. Inomata-Kurashiki, H. Nakatsuji, T. Natsukawa, A. Yoshikawa, T. Kajimoto and T. Kimura for their valuable help with this study.
Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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