[1] Columbia Univ, Div Scholarship & Res, Sch Nursing, New York, NY 10032 USA
[2] Tulane Sch Publ Hlth & Trop Med, Dept Social Behav & Populat Sci, New Orleans, LA 70112 USA
[3] Univ North Carolina, Dept Psychiat, Sch Med, Chapel Hill, NC 27599 USA
[4] Univ Illinois, Coll Appl Hlth Sci, Dept Kinesiol & Community Hlth, Champaign, IL 61820 USA