After publication of the original article [1] it was found that author Aniruddha Ghose was accidentally omitted from the list of authors. This has now been corrected with this erratum. The updated ‘Authors’ Contributions’ section reads as follows:

MTH, NS, and SJL drafted the manuscript. NS, NL, and JT devised and performed LCMS analyses. NJW, NPJD, and AMD conceived of the study. SD, MTH, RJM, MAF, MMUH, MAH, SMo, SMi, CJW, and AG contributed to the design. MTH, SJL, SD, RJM, HWFK, KP, PC, KS, and KC provided clinical and diagnostic data collection and critically revised the manuscript. All authors read and approved the final manuscript.