1. Department of Radiology, College of Medicine, University of Ibadan, Ibadan, Nigeria.
2. Institute of Cardiovascular Diseases, College of Medicine, University of Ibadan, Ibadan, Nigeria.
3. Department of Obstetrics and Gynaecology, and College of Medicine, University of Ibadan, Ibadan, Nigeria.
4. Institute of Medical Research and Advanced Training, College of Medicine, University of Ibadan, Ibadan, Nigeria.