1. Department of Anatomy, Faculty of Medicine, The National University, Khartoum, Sudan
2. Department of Anatomy, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
3. Department of Human Anatomy and Embryology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
4. Department of Human Anatomy and Embryology, Faculty of Medicine, Menoufia University, Menoufia, Egypt
5. Department of Family and Community Medicine, Ibn Sina National College for Medical Studies, Jeddah, Saudi Arabia