1. 1Palliative Care, Prince Sultan Oncology Centre, North West Armed Forces Hospital, Tabuk, Saudi Arabia
2. 2Department of Biostatistics and Epidemiology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
3. 3Palliative Care Medicine, Oncology Centre, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia