1. Neuromuscular Research Unit, Department of Neurology (M.C.O., T.D.J., S.H., N.P., J.V.), DK-2100 Copenhagen, Denmark;
2. Copenhagen Muscle Research Center (M.C.O., T.D.J., S.H., N.P., J.V., G.H.), DK-2100 Copenhagen, Denmark;
3. Neuromuscular Center (T.T., K.H., R.G.H.), Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, and the Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, Texas 75235;
4. Department of Neurology (R.G.H.), North Texas VA Medical Center, Dallas, Texas 75216
5. Clinical Metabolomics Core Facility (G.H.), Rigshospitalet, DK-2100 Copenhagen, Denmark;
6. Department of Biomedical Sciences (G.H.), Faculty of Health and Medical Sciences, University of Copenhagen, DK-2100 Copenhagen, Denmark;