Division of Neurology Department of Medicine University of Hong Kong Hong Kong China;
Division of Neurology Department of Medicine University of Hong Kong Hong Kong ChinaResearch Centre of Heart Brain Hormone and Healthy Aging(HBHA) University of Hong Kong Hong Kong China;
Parkinson''s disease; Monoamine oxidase-B inhibitors; Disease-modification; Neuroprotection; Selegiline; Rasagiline;