1 Research Centre on Health Policies and Systems - International Health (Polissi), School of Public Health, Université Libre de Bruxelles, Brussels 1070, Belgium. Electronic address: patricia.st.louis@ulb.be.
2 Research Centre on Health Policies and Systems - International Health (Polissi), School of Public Health, Université Libre de Bruxelles, Brussels 1070, Belgium; École Régionale de Santé Publique, Université Catholique de Bukavu, Bukavu, Democratic Republic of the Congo.
3 Research Centre on Health Policies and Systems - International Health (Polissi), School of Public Health, Université Libre de Bruxelles, Brussels 1070, Belgium.