[1] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, 615 North Wolfe St,6501, Baltimore, MD 21205 USA
[2] Georgetown Univ, Med Ctr, Inst Etiol Res, Washington, DC 20007 USA
[3] Univ Penn, Sch Nursing, Philadelphia, PA 19104 USA
[4] CUNY Hunter Coll, Brookdale Ctr Hlth Aging, New York, NY 10021 USA
[5] Univ Pittsburgh, Grad Sch Publ Hlth, Dept Behav & Community Hlth Sci, Pittsburgh, PA USA
[6] Northwestern Univ, Dept Psychiat & Behav Sci, Evanston, IL 60208 USA
[7] Univ Pittsburgh, Dept Behav & Community Hlth Sci, Pittsburgh, PA USA
[8] Univ Calif Los Angeles, Dept Epidemiol, Los Angeles, CA USA
[9] Univ Pittsburgh, Grad Sch Publ Hlth, Dept Infect Dis & Microbiol, Pittsburgh, PA 15261 USA
[10] Georgetown Univ, Med Ctr, Dept Biostat Bioinformat & Biomath, Washington, DC 20007 USA