1. Ibb University of Medical Sciences, Ibb, Yemen
2. Al Wakra Hospital, Hamad Medical Corporation, Al Wakrah, Qatar
3. 21 September University, Sana’a, Yemen
4. Jeblah University for Medical and Health Sciences, Ibb, Yemen
5. King Khalid Hospital, Najran, Saudi Arabia
6. Sana’a University, Sana’a, Yemen