DPRCT: double-blind, placebo-controlled, randomized clinical trial, MAOI: monoamine oxidase inhibitor, ADCS-ADL: alzheimer's disease cooperative study-activities of daily living, MMSE: mini-mental status examination, ADAS-total: alzheimer's disease assessment scale-total score, ADAS-Cog: alzheimer's disease assessment scale-cognitive subcomponent, CGIC: clinical global impression of change, UPDRS: unified parkinson disease rating scale.