Affiliation: | 1. Internal Medicine, University of Gezira, Khartoum Sudan ; 2. Wad Medani Isolation Centers, Khartoum Sudan ; 3. Medani Heart Diseases and Surgery Center, University of Bakht Alruda, Khartoum Sudan ; 4. Alzaiem Alazhari University, Khartoum Sudan ; 5. Medical Doctor at Kiambu level 5 Hospital, University of Bakht Alruda, Nairobi Kenya ; 6. Faculty of Medicine, University of Khartoum, Khartoum Sudan |