1. Department of NeurologyUniversity of California IrvineIrvineCAUSA
2. Department of Neurobiology and BehaviorUniversity of California IrvineIrvineCAUSA
3. Retired from Beltsville Human Nutrition Research CenterUnited States Department of AgricultureBeltsvilleMDUSA
4. Clinical Research BranchNational Institute on AgingBaltimoreMDUSA
5. Department of BiostatisticsJohns Hopkins Bloomberg School of Public HealthBaltimoreMDUSA