In page 2, the first sentence under the heading “Comparison of remifentanil with other intravenous opioids and epidural analgesia (Table 1)” should read, Douma [10] compared pain scores and observer sedation scores among 159 women receiving remifentanil, fentanyl, and meperidine for labor analgesia, demonstrating a significant decrease in mean (SD) visual analogue scale (VAS) pain scores in the remifentanil group [−3.2 (2.9) cm] compared to fentanyl [−1.4 (2.4) cm; p < 0.01] and meperidine groups [−0.8 (2.2) cm; p < 0.001] at 1 h, followed by a return to the baseline over time.