1. Department of Community Medicine, Faculty of Medicine, Al-Hikma University, Sana'a, Yemen.
2. Department of Anatomy and Physiology, School of Public Health and Interdisciplinary Studies, Faculty of Health and Environmental Sciences, Auckland University of Technology, New Zealand.
3. Department of Dentistry, Al-Kut University College, 52001, Wasit, Iraq.
4. Ballyrevagh, Newtowncashel Co. Longford, Ireland.