1. Rufa'a Teaching Hospital Rufaa Sudan
2. General surgeon Rufa'a Teaching Hospital, Albutana University Rufaa Sudan
3. Consultant Surgeon, Rufa'a Teaching Hospital Albutana University Rufaa Sudan
4. Institute of Endemic diseases, University of Khartoum Khartoum Sudan
5. Swiss Tropical and Public Health Institute (Swiss TPH) Allschwil Switzerland
6. University of Basel Basel Switzerland
7. Department of Medical Microbiology and Infectious Diseases ErasmusMC, University Medical Center Rotterdam Rotterdam the Netherlands
8. Faculty of Medical Laboratory sciences University of Khartoum Khartoum Sudan