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. Department of Medical Oncology, Faculty of Medicine, Zagazig University, Sharkia, Egypt
4. Department of Medical Oncology, National Cancer Institute, Cairo University, Cairo, Egypt
5. Department of Clinical Oncology, Kasr Al-Ainy Center of Clinical Oncology & Nuclear Medicine (NEMROCK), Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt