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.