Barnes H, McDonald J, Smallwood N, Manser R. Opioids for the palliation of refractory breathlessness in adults with advanced disease and terminal illness. 2016 [cited 2018 Oct 03]; Available from: https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD011008.pub2/epdf/standard

BMJ Best Practice. Palliative care. 2018 [cited 2018 Oct 03]; Available from: https://bestpractice.bmj.com/topics/en-gb/1020

Caraceni A, Hanks G, Kaasa S, Bennett MI, Brunelli C, Cherny N, et al. Use of opioid analgesics in the treatment of cancer pain: evidence-based recommendations from the EAPC. Lancet Oncol. 2012;13(2):e58-68.

Caraceni A, Kaasa S, Fallon M, Pigni A, Brunelli C. Cancer pain management: a systematic review on the assessment, classification and treatment of cancer pain in adult patients. 2014 [cited 2017 Sep 12]; Available from: http://www.crd.york.ac.uk/prospero/display_record.asp?src=trip&ID=CRD42014009150

CareSearch. Opioid Analgesics. 2017 [cited 2018 Oct 03]; Available from: https://www.caresearch.com.au/caresearch/tabid/749/Default.aspx

CareSearch. Managing opioids. 2017 [cited 2018 Oct 03]; Available from: https://www.caresearch.com.au/caresearch/tabid/3404/Default.aspx

Clinical Knowledge Summaries. Strong opioids. 2016 [cited 2018 Oct 03]; Available from: https://cks.nice.org.uk/palliative-cancer-care-pain#!prescribinginfosub:2

NICE. Palliative care for adults: strong opioids for pain relief CG140. 2016 [cited 2018 Oct 02]; Available from: https://www.nice.org.uk/guidance/cg140

Watson M, Armstrong P, Gannon C, Sykes N, Back I. Palliative Care Guidelines. Opioid side effects & toxicity. 2016 [cited 2018 Oct 03]; Available from: http://book.pallcare.info/index.php?tid=26

Wiffen PJ, Wee B, Derry S, Bell RF, Moore RA. Opioids for cancer pain ‐ an overview of Cochrane reviews. 2017 [cited 2018 Oct 03]; Available from: https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD012592.pub2/epdf/standard