1. Department of Community Health and Primary Care, College of Medicine, University of Lagos/Lagos University Teaching Hospital, Lagos, Nigeria
2. Department of Community Medicine, University of Ibadan/University College Hospital, Ibadan, Nigeria
3. Department of Health Policy and Management, University of Ibadan/University College Hospital, Ibadan, Nigeria
4. Department of Epidemiology and Medical Statistics, University of Ibadan/University College Hospital, Ibadan, Nigeria