Correction
Following publication of the original article [1], the author reported the errors in the figure and in text reference in the published article. These errors are detailed below. The original article has been corrected.
1. Figure 2 SPIRIT-figure appears in the manuscript although it is only meant as online supplementary material.
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2. In the Design section, the citation for the supplementary online materials should be “Additionally, Fig. 2 (SPIRIT-figure) and File 1 (SPIRIT-checklist) are available online” instead of “Fig. 2 and Additional file 1 are available online”.
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