1. Urology department at CHU de Libreville , Libreville, , Gabon
2. Department of Surgery at Université des Sciences de la Santé (USS) , Libreville, , Gabon
3. Department of General and Urological Surgery , Libreville, , Gabon
4. Omar Bongo Ondimba Army Training Hospital , Libreville, , Gabon
5. Department of Medicine at Université des Sciences de la Santé (USS) , Libreville, , Gabon
6. Department of epidemiology and statistics at Université des Sciences de la Santé (USS) , Libreville, , Gabon
7. Inserm U1094 , Limoges, , France
8. IRD U270 , Limoges, , France
9. Univ. Limoges , Limoges, , France
10. CHU Limoges , Limoges, , France
11. EpiMaCT - Epidemiology of chronic diseases in tropical zone , Limoges, , France
12. Institute of Epidemiology and Tropical Neurology , Limoges, , France
13. OmegaHealth , Limoges, , France