1. Churches Health Association of Zambia, Lusaka 10101, Zambia
2. Laboratory Department, Solwezi General Hospital, Solwezi 10101, Zambia
3. Department of Epidemiology and Biostatistics, School of Public Health, Zhengzhou University, Zhengzhou 450001, China
4. Public Health Department, Michael Chilufya Sata School of Medicine, Copperbelt University, Ndola 21692, Zambia
5. Department of Pharmacy, School of Health Sciences, University of Zambia, Lusaka 10101, Zambia
6. Global Fund to Fight AIDS, Tuberculosis and Malaria (GFATM), 1218 Geneva, Switzerland