1. Department of Medicine, Obafemi Awolowo University Teaching Hospital Complex, Ile-Ife, Osun State, Nigeria
2. Department of Anatomic & Molecular Pathology, College of Medicine University of Lagos, Lagos, Nigeria
3. Department of Medicine, Ahmadu Bello University Teaching Hospital, Zaria, Kaduna State, Nigeria
4. Department of Surgery, Federal Medical Center, Owerri, Imo State, Nigeria
5. Department of Medicine, University of Benin Teaching Hospital, Edo State, Nigeria