Childhood-onset writer's cramp, with later ataxia: A clue to COQ8A-related disorders.

Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Non competing financial interests include: Dr. Stephen has performed scientific advisory for SwanBio Therapeutics and received research funding from Sanofi-Genzyme for a study in late-onset GM2 gangliosidosis. He has received financial support from SwanBio Therapeutics, Encora Therapeutics, Sanofi-Genzyme, Biogen, and Biohaven for the conduct of clinical trials and received honoraria from the International Parkinson and Movement Disorder Society, American Academy of Neurology and Oakstone CME. He has received grant support from the National Institutes of Health K23 NS118045-03.