1. Departments of Public Health Sciences and Medicine, Loyola University Stritch School of Medicine, Maywood, Illinois
2. Department of Medicine, Komfo Anokye Teaching Hospital, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
3. Department of Medicine, University College Hospital, University of Ibadan, Nigeria
4. Department of Epidemiology, Johns Hopkins University School of Public Health, Baltimore, Maryland