1. Department of Family Medicine, University College Hospital, Ibadan, Nigeria;
2. Department of Virology, College of Medicine, University of Ibadan, Ibadan, Nigeria;
3. Department of Clinical Pharmacology and Therapeutics, College of Medicine, University of Ibadan, Ibadan, Nigeria;
4. Department of Medical Microbiology and Parasitology, College of Medicine, University of Ibadan, Ibadan, Nigeria;
5. Department of Medicine, College of Medicine, University of Ibadan, Ibadan, Nigeria;
6. Division of Infectious Diseases, Feinberg School of Medicine, Northwestern University, Chicago, Illinois