1. Department of Public Health, Faculty of Medicine and Biomedical Sciences, University of Yaoundé 1, Yaoundé, Cameroon
2. Sickle Cell Disease Unit, Mother and Child Centre of the Chantal BIYA Foundation, Yaoundé, Cameroon
3. Department of Epidemiology and Public Health, Centre Pasteur of Cameroon, Yaoundé, Cameroon
4. Faculty of Medicine, University of Paris Sud XI, Le Kremlin Bicêtre, France