[1] Inst Rech Sci Sante IRSS, Ouagadougou, Burkina Faso
[2] Inst Africain Sante Publ IASP, Ouagadougou, Burkina Faso
[3] Minist Hlth, Ouagadougou, Burkina Faso
[4] Univ NDjamena, Fac Sci Sante Humaine, Ndjamena, Chad
[5] WHO Reg Off Africa, Reprod Maternal Hlth & Ageing, Brazzaville, Rep Congo
[6] WHO IST Off Cent Africa, WHO Intercountry Support Team, Reprod Maternal Hlth & Ageing, Libreville, Gabon