[1] Univ Douala, Fac Med & Sci Pharmaceut, BP 2701, Douala, Cameroon
[2] Univ Douala, Ecole Doctorale, Douala, Cameroon
[3] Univ Douala, Fac Sci, Douala, Cameroon
[4] Univ Ouaga, Unite Format & Rech Sci Sante, 1 Prof Joseph Ki Zerbo, Ouagadougou, Burkina Faso
[5] Univ Jean Monnet, Lab EA SNA EPIS 4607, F-42100 St Etienne, France