1. Health and Social Care Information Centre 2013 Prescriptions Dispensed in the Community, Statistics for England - 2002 - 2012 http://www.hscic.gov.uk/catalogue/PUB11291/pres-disp-com-eng-2002-12-rep.pdf
2. The comparative safety of analgesics in older adults with arthritis;Solomon;Archives of Internal Medicine,2010
3. Secondary adrenal failure and secondary amenorrhoea following hydromorphone treatment;Müssig;Clinical Endocrinology,2007
4. Chronic fentanyl application induces adrenocortical insufficiency;Oltmanns;Journal of Internal Medicine,2005
5. Hypothalamus-pituitary-adrenal axis of heroin addicts;Facchinetti;Drug and Alcohol Dependence,1985