Correction to: Pediatric Research; https://doi.org/10.1038/s41390-018-0235-1; published online 22 November 2018

In the original version of this article, the Supplementary Information file contained incorrect reference numbers. ‘Supplemental Table S1’ has now been replaced with the corrected version, in which the correct reference numbers are cited. The authors would like to apologise for this error.