1. Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
2. Lamont-Doherty Earth Observatory, Columbia University, New York, NY, USA
3. Competence Centre, West African Science Service Centre on Climate Change and Adapted Land Use, Ouagadougou, Burkina Faso
4. Ecole Normale Superieure de l'Université de Koudougou, Koudougou, Burkina Faso