1 Department of Public Health, Institute of Tropical Medicine, 2000 Antwerp, Belgium; Julius Center for Health Sciences and Primary Care, Utrecht University, Utrecht, Netherlands. Electronic address: [email protected].
2 Clinical Research Unit of Nanoro, Nanoro, Burkina Faso.
3 Kimpese Health Research Center, Kimpese, Democratic Republic of the Congo.
4 Department of Public Health, Institute of Tropical Medicine, 2000 Antwerp, Belgium; Julius Center for Health Sciences and Primary Care, Utrecht University, Utrecht, Netherlands.