1. Centre de Connaissances en Santé en République Démocratique du Congo, Kinshasa 3088, Democratic Republic of the Congo
2. Kinshasa School of Public Health, University of Kinshasa, Kinshasa 127, Democratic Republic of the Congo
3. Public Health Faculty, Ghana College of Physicians and Surgeons, Accra MB 429, Ghana
4. Institute of Tropical Medicine, 2000 Antwerp, Belgium
5. School of Public Health, University of Western Cape, Cape Town 7530, South Africa
6. Faculty of Medicine, University of Lubumbashi, Lubumbashi 1825, Democratic Republic of the Congo
7. School of Public Health, University of Lubumbashi, Lubumbashi 1825, Democratic Republic of the Congo