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.

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”.