1. Department of Community Medicine, Niger Delta University, Wilberforce Island, Bayelsa State Nigeria, Nigeria
2. Department of Community Medicine, University of Uyo Teaching Hospital, Uyo, Akwa Ibom State, Nigeria
3. Department of Community Medicine, University College Hospital, Ibadan, Oyo State, Nigeria
4. Department of Internal Medicine, University of Abuja, Circulatory Health Research Laboratory, College of Health Sciences, Abuja, Nigeria