A randomized clinical trial of high-dosage coenzyme Q10 in early Parkinson disease: no evidence of benefit. - Beal MF; Oakes D; Shoulson I; Henchcliffe C; Galpern WR; Haas R; Juncos JL; Nutt JG; Voss TS; Ravina B; Shults CM; Helles K; et al. (JAMA neurology, 2014)