Population dynamics in rural areas freed from Onchocerciasis in West Africa : Benin (CEFORP), Burkina Faso (UERD), Cote D'ivoire (ENSEA), Ghana (Rips), Guinea (DNSI), Mali (DNSI), Niger (DSCN), Senegal (DPS), Togo (URD) : synthesis of national monographs - Quesnel, André; Vignikin, Emilien Kokou; Zanou, Benjamin; N'Guessan, Koffi; Vilquin, Eric (The CICRED monographs, 1999)