1. Department of Anatomy and Histology, Faculty of Medicine, the University of Jordan and Ibn Sina University for Medical Sciences, Amman, Jordan
2. Department of Basic Medical Sciences, Faculty of Medicine, Ibn Sina University for Medical Sciences, Amman, Jordan
3. Department of Histology and Cell Biology, Faculty of Medicine, Tanta University, Tanta, Egypt
4. Department of Human Anatomy and Embryology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
5. Department of Physiology, Faculty of Medicine, Mansoura University, Mansoura, Egypt