1. American Society of PeriAnesthesia Nurses (2003) ASPAN Pain and Comfort Clinical Guideline. www.aspan.org/Portals/6/docs/ClinicalPractice/Guidelines/ASPAN_ClinicalGuideline_PainComfort.pdf (Last accessed: 16 December 2020.)
2. The differentiation between pain and discomfort: a concept analysis of discomfort;Pain Management Nursing,2019
3. Metabolic considerations in management of surgical patients;Surgical Clinics of North America,2011
4. Assessing pain in verbal older adults;Nursing,2016
5. Current pain education within undergraduate medical studies across Europe: Advancing the Provision of Pain Education and Learning (APPEAL) study;BMJ Open,2015