1 Department of Epidemiology and Population Health, School of Public Health and Information Sciences, University of Louisville, Louisville, KY 40202, USA; Department of Public and Environmental Health, School of Medicine and Allied Health Sciences, University of The Gambia, Banjul, The Gambia. Electronic address: anne.wallis@louisville.edu.
2 Department of Public and Environmental Health, School of Medicine and Allied Health Sciences, University of The Gambia, Banjul, The Gambia; Department of Occupational and Environmental Sciences, College of Public Health, University of Iowa, Iowa City, IA, USA.