1. Faculty of Health Sciences, Walter Sisulu University, Mthatha 5117, South Africa
2. Department of Internal Medicine, University of Kinshasa, Kinshasa, Democratic Republic of Congo
3. Department of Radiology, Kinshasa University, Democratic Republic of Congo
4. University of Marien Ngouabi, Brazzaville, Democratic Republic of Congo
5. Lomo Medical Cardiovascular Centre for Africa, Limete, Kinshasa, Democratic Republic of Congo