1. Faculty of Medicine, University of Khartoum, Khartoum, Sudan
2. Adjunct instructor- Biology, Tarrant County College Northwest Campus, Fort Worth, TX, USA
3. Department of Pathology, Faculty of Medicine, Jazan University, Jazan, Kingdom of Saudi Arabia
4. Department of Obstetrics and Gynecology, Unaizah College of Medicine and Medical Sciences, Qassim University, Unaizah, Kingdom of Saudi Arabia