Alfradique-Dunham I, Al-Ouran R, von Coelln R, Blauwendraat C, Hill E, Luo L, Stillwell A, Young E, Kaw A, Tan M, Liao C, Hernandez D, Pihlstrom L, Grosset D, Shulman LM, Liu Z, Rouleau GA, Nalls M, Singleton AB, Morris H, Jankovic J, Shulman JM. Genome-Wide Association Study Meta-Analysis for Parkinson Disease Motor Subtypes. Neurol Genet. 2021 Apr; 7(2):e557.