1. Department of Medicine, Faculty of Medicine, Eduardo Mondlane University , Maputo , Mozambique
2. Research unit of the Department of Medicine, Maputo Central Hospital , Maputo , Mozambique
3. Division of Non-Communicable Diseases, National Health Institute , Maputo , Mozambique
4. Department of Medicine & Cardiology, Faculty of Health Sciences, Cape Heart Institute, University of Cape Town , 3 Anzio Road, Observatory 7925, Cape Town , South Africa