1. a Department of Epidemiology , University of Alabama at Birmingham , Birmingham , AL , USA
2. b AIDS ALLY and St. Markus Hospital , Kumasi , Ghana
3. c Department of Microbiology , Biochemistry and Immunology, Morehouse School of Medicine , Atlanta , GA , USA
4. d Department of Environmental Health Science , University of Georgia , Athens , GA , USA
5. e Department of Veterinary Integrative Biosciences , Texas A&M University , College Station , TX , USA
6. f College of Agricultural and Environmental Sciences , University of Georgia , Griffin , GA , USA