1. Laboratory of EpidemiologyDemography, and Biometry, National Institute on Aging, National Institutes of HealthBethesdaMDUSA
2. Institute of PsychiatryKing's College LondonLondonUK
3. Institute for Ageing and HealthNewcastle UniversityNewcastle on TyneUK
4. Internal Medicine DepartmentUniversidad Nacional Pedro Henriquez Ureña (UNPHU)Santo DomingoDominican Republic