1. Department of Internal Medicine, King Hussein Cancer Center, Amman 11941, Jordan
2. Section of GI Oncology, Houston Methodist Neal Cancer Center, Houston, TX 77030, USA
3. Division of Hematology and Oncology, Department of Internal Medicine, Naef K. Basile Cancer Institute, American University of Beirut Medical Center, Beirut P.O. Box 11-0236, Lebanon
4. Department of Radiation Oncology, King Hussein Cancer Center, Amman 11941, Jordan