1. From the Department of Preventive Medicine and Epidemiology, Loyola University Stritch School of Medicine, Maywood, IL (AL, RD-A, GC, and RC); the University College Hospital, University of Ibadan, Ibadan, Nigeria (AA and BT); the Human Genome Center, Howard University, Washington, DC (AA); and the Department of Social and Preventive Medicine, SUNY at Buffalo, Buffalo, NY (BT)