Clinical effects of 12-week in-home randomized controlled clinical trial of a novel in-home multifunctional rehabilitation standing and stepping device (MRSSD) vs. static standing desk vs. usual care control groups use in Parkinson's disease (PD) - Nicolaas Ida Bohnen, M.D., Ph.D.; Chaetkow Pongmala, Ph.D.; Warren VanHout, Ph.D.; August Van Hout; Miriam van EM.D.e Boas, DP.T. (Neurotherapeutics)