1. Division of Clinical Pharmacology, Department of Laboratory Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, 14186 Stockholm, Sweden
2. College of Medicine and Health Sciences, University of Rwanda, KK 737, Kigali P.O. Box 4285, Rwanda
3. Rwanda Food and Drugs Authority, Nyarutarama Plaza, KG 9 Avenue, Kigali P.O. Box 1948, Rwanda