Competing Interests: BL is Chair of Trial of Ondansetron as a Parkinson's HAllucinations Treatment, and Member of the World Dementia Council. AI has received grants from Takeda, Agencia Nacional de Investigación y Desarrollo de Chile, National Institutes of Health and the Fogarty International Center, National Institute on Aging, Tau Consortium, Alzheimer's Association, Rainwater Charitable Foundation, and Global Brain Health Institute. WDD has received grants from National Institute on Aging, Latin American Brain Health Institute, Oregon Health Authority, Portland State University Foundation. All other authors declare no competing interests.