Efficacy of biologically-directed daylight therapy on sleep and circadian rhythm in Parkinson's disease: a randomised, double-blind, parallel-group, active-controlled, phase 2 clin... oleh Beatrix Feigl, Simon J.G. Lewis, Lucy D. Burr, Daniel Schweitzer, Subodh Gnyawali, Dimitrios Vagenas, Drew D. Carter, Andrew J. Zele