Disclosure statement
The authors declare no conflict of interests.
Funding information
RWT is supported by the Wellcome Trust Centre for Mitochondrial Research, the Medical Research Council (UK) Centre for Translational Muscle Disease Research, The Lily Foundation and the UK NHS Highly Specialised Commissioners which funds the ‘Rare Mitochondrial Disorders of Adults and Children’ Diagnostic Service in Newcastle upon Tyne (http://www.newcastle-mitochondria.com). CLA is a recipient of a National Institute for Health Research (NIHR) doctoral fellowship. The views expressed are those of the authors and not necessarily those of the NHS, the NIHR or the Department of Health. PK and PFC are supported by the Wellcome Trust Centre for Mitochondrial Research.