1. Department of Medicine and Therapeutics, University of Ghana Medical School , Accra , Ghana
2. Department of Medicine, Korle Bu Teaching Hospital , Accra , Ghana
3. Department of Population, Family, and Reproductive Health, School of Public Health, University of Ghana , Accra , Ghana
4. National AIDS/STI Control Programme, Ghana Health Service , Accra , Ghana
5. Ghana Field Epidemiology and Laboratory Training Programme, Department of Epidemiology and Disease Control, School of Public Health, University of Ghana , Accra , Ghana