1. Assistant Professor, Institute of Demographic and Life Course Studies; University of Geneva; UniMail, 40 Bl Pont d'Arve 1211 Geneva 4 Switzerland
2. Associate Researcher; Institut National d'Etudes Démographiques; Paris France
3. Research Assistant, Institut Supérieur des Sciences de la Population; University of Ouagadougou; Burkina Faso
4. Senior Lecturer, Institut Supérieur des Sciences de la Population; University of Ouagadougou; Burkina Faso