Econometric Institute, Erasmus University Rotterdam, Rotterdam, The Netherlands.|Econometric Institute, Erasmus University Rotterdam, Rotterdam, The Netherlands.|Department of Public Health, Institute Of Tropical Medicine, Antwerp, Belgium.|Programme National de Lutte contre la Trypanosomiase Humaine Africain (PNLTHA), Kinshasa, Democratic Republic of Congo.|University of Kinshasa, Kinshasa, Democratic Republic of Congo.|Department of Public Health, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.|Institute of Health Policy and Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.