1. Cancer pain relief,1986
2. Effectiveness of the World Health Organization cancer pain relief guidelines: an integrative review;Carlson;J Pain Res,2016
3. WHO Guidelines for the pharmacological and radiotherapeutic management of cancer pain in adults and adolescents,2018
4. Commission on the provision of surgical services. Working party on pain after surgery, College of Anaesthetists. Report of the working Party on pain after surgery,1990
5. Management of acute pain;Koneti;Surgery (Oxford),2016