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