Erratum to: Common data elements for clinical research in mitochondrial disease: a National Institute for Neurological Disorders and Stroke project. Issue 1 (4th October 2017) - Karaa, Amel; Rahman, Shamima; Lombès, Anne; Yu‐Wai‐Man, Patrick; Sheikh, Muniza K.; Alai‐Hansen, Sherita; Cohen, Bruce H.; Dimmock, David; Emrick, Lisa; Falk, Marni J.; McCormack, Shana; Mirsky, David; et al.