1. Department of Internal Medicine and Specialties, Faculty of Medicine and Biomedical Sciences, University of Yaounde I, Yaounde P.O. Box 812, Cameroon
2. Department of Surgery and Specialties, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala P.O. Box 2701, Cameroon
3. Pôle de Geriatrie/Gérontologie CHU de Martinique, Equipe EpiCliV, Université des Antilles, 97233 Fort-de-France-Martinique, France
4. Non-Communicable Diseases Research Unit, South African Medical Research Council, University of Cape Town, Cape Town 7700, South Africa
5. Department of Biological and Environmental Sciences, Faculty of Natural Sciences, Walter Sisulu University, Mthatha 5700, South Africa
6. Department of Internal Medicine and Specialties, Faculty of Medicine and Pharmaceutical Sciences, University of Dschang, Dschang P.O. Box 96, Cameroon
7. Department of Surgery and Specialties, Faculty of Medicine and Biomedical Sciences, University of Yaounde I, Yaounde P.O Box 812, Cameroon