1. Department of Internal Medicine, Federal Medical Centre, Asaba, Delta State, Nigeria.
2. Cardiac Care Unit, Department of Medicine, Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria.
3. Department of Medical Pharmacology and Therapeutics, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria.
4. Department of Medicine, Federal Staff Hospital, Abuja, Nigeria.