1. Faculty of Medicine; University of Oslo; Oslo Norway
2. Oeuvre de Santé de l'Eglise Evangélique Luthérienne au Cameroun; Ngaoundéré Cameroon
3. Centre for Pediatric and Pregnancy Related Pathology, Department of Pathology; Oslo University Hospital Ulleval; Oslo Norway
4. Norwegian Centre for Imported and Tropical Diseases, Department of Infectious Diseases; Oslo University Hospital Ulleval; Oslo Norway