1. Oncology Center, King Abdullah Medical City-Holy Capital, Makkah, Saudi Arabia
2. Palliative Medicine Unit, Kasr Al-Ainy Center of Clinical Oncology & Nuclear Medicine (NEMROCK), Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
3. Medical Oncology Department, Faculty of medicine, Zagazig University, Sharkia, Egypt
4. Clinical Oncology Department, Kasr Al-Ainy Center of Clinical Oncology & Nuclear Medicine (NEMROCK), Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt