1. World Health Organization: WHO Definition of Palliative Care. Available at http://www.who.int/cancer/palliative/definition/en/
2. Palliative care;Morrison;N Engl J Med,2004
3. Principles of symptom control in terminal care;Saunders;Med Clin North Am,1982
4. How many people will need palliative care in 2040? Past trends, future projections and implications for services;Etkind;BMC Med,2017
5. Center to Advance Palliative Care: Palliative Care Facts and Stats. Available at https://media.capc.org/filer_public/68/bc/68bc93c7-14ad-4741-9830-8691729618d0/capc_press-kit.pdf.