1. Department of Radiation Oncology American University of Beirut Medical Center Riad El‐Solh 1107 2020 Beirut Lebanon
2. Department of Medical Physics Al‐Neelain University Khartoum 11121Sudan
3. Department of Physics King Fahd University of Petroleum and Minerals Dhahran 31261Saudi Arabia
4. Department of Radiation Oncology American Hospital Dubai Dubai United Arab Emirates