1. Department of Preventive Medicine and Epidemiology, Loyola University Stritch School of Medicine, Maywood, IL 60153
2. Departments of Pathology and Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, NC 27157-1040
3. Departments of Epidemiology and Nutrition, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7435