1. Department of Medicine and Surgery, University of Ilorin, Ilorin, Nigeria
2. Department of Medicine and Surgery, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
3. Bowen University Teaching Hospital, Ogbomoso, Nigeria
4. College of Medicine, University of Ibadan, Ibadan, Nigeria
5. Department of Medicine and Surgery, Obafemi Awolowo University, Ife, Nigeria
6. Dow University of Health Sciences, Karachi, Pakistan.