1. Department of Epidemiology, Circulatory Health Research Laboratory, College of Health Sciences, University of Abuja, Abuja, Nigeria
2. Department of Community Health, University of Uyo Teaching Hospital, Uyo, Nigeria
3. Department of Medicine, Chukwuemeka Odumegu Ojukwu University Teaching Hospital, Awka, Nigeria
4. Department of Medicine, Federal Medical Centre Gusau, Gusau, Nigeria
5. Department of Chemical Pathology, Faculty of Basic Clinical Sciences, University of Abuja, Abuja, Nigeria
6. Department of Medicine, Federal Teaching Hospital Gombe, Gombe, Nigeria
7. Department of Medicine, University of Uyo Teaching Hospital, Uyo, Nigeria
8. Department of Human Physiology, Faculty of Basic Medical Sciences, University of Abuja, Abuja, Nigeria
9. Department of Medicine, University College Hospital Ibadan, Ibadan, Nigeria
10. Department of Medicine, Alex Ekwueme Federal University Teaching Hospital Abakaliki, Abakaliki, Nigeria