1. a Department of Maternal and Child Health , University of Alabama at Birmingham , Ryals Public Health Building, Suite 320, 1665 University Boulevard, Birmingham , AL , 35294 , USA
2. b Department of Human Studies, School of Education , University of Alabama at Birmingham , Education Building EB 202, 901 13th Street South, Birmingham , AL , 35294 , USA
3. c Department of Epidemiology , University of Alabama at Birmingham , Ryals Public Health Building, Suite 217L, 1665 University Boulevard, Birmingham , AL , 35294 , USA
4. d Department of Community and Family Health, College of Public Health , University of South Florida , 12901 Bruce B. Downs Building, Tampa , FL , 33612 , USA
5. e Center for the Study of Community Health , University of Alabama at Birmingham , Liberty National Building, Suite 1078B, 2001 3rd Avenue South, Birmingham , AL , 35233 , USA
6. f Department of Epidemiology and Biostatistics , Makerere University School of Public Health , P.O. Box 7072, Kampala , Uganda
7. g AIDS Information Center , P.O. Box 10446, Kampala , Uganda
8. h Division of Health Promotion Sciences, Mel and Enid Zuckerman College of Public Health , The University of Arizona , A256 Drachman Hall, 1295 N. Martin Avenue, P.O. Box 245209, Tucson , AZ , 85724-5209 , USA