1. 1Masanga Hospital (MH), Masanga, Tonkolili District, Sierra Leone;
2. 2Masanga Medical Research Unit (MMRU), Masanga, Tonkolili District, Sierra Leone;
3. 3Lion Heart Medical Centre (LHMC), Yele, Tonkolili District, Sierra Leone;
4. 4Department of Oral and Maxillofacial Surgery, University Medical Center Groningen-University of Groningen, The Netherlands;
5. 5Center of Tropical Medicine and Travel Medicine, Division of Internal Medicine, Amsterdam University Medical Centers, location AMC, University of Amsterdam, The Netherlands