Hill EJ, Mangleburg CG, Alfradique-Dunham I, Ripperger B, Stillwell A, Saade H, Rao S, Fagbongbe O, von Coelln R, Tarakad A, Hunter C, Dawe RJ, Jankovic J, Shulman LM, Buchman AS, Shulman JM. Quantitative mobility measures complement the MDS-UPDRS for characterization of Parkinson's disease heterogeneity. Parkinsonism Relat Disord. 2021 03; 84:105-111.