[1] Univ Washington, Dept Neurol, Seattle, WA 98195 USA
[2] Vet Adm Puget Sound Hlth Care Syst, Mental Illness Res Educ & Clin Ctr, Seattle, WA USA
[3] Vet Adm Puget Sound Hlth Care Syst, Parkinson Dis Res Educ & Clin Ctr, Seattle, WA USA
[4] Virginia Mason Clin, Vet Adm Puget Sound Hlth Care Syst, Seattle, WA 98101 USA
[5] Vet Adm Med Ctr, Ctr Geriatr Res Educ & Clin, Seattle, WA 98108 USA
[6] Univ Pittsburgh, Sch Med, Dept Psychiat, Pittsburgh, PA USA
[7] Univ Pittsburgh, Sch Med, Dept Neurol, Pittsburgh, PA 15261 USA