@article {65, editor = {,}, title = {Purpose and procedure}, volume = {14}, number = {3}, pages = {65--65}, year = {2009}, doi = {10.1136/ebm.14.3.65}, publisher = {Royal Society of Medicine}, issn = {1356-5524}, URL = {https://ebm.bmj.com/content/14/3/65}, eprint = {https://ebm.bmj.com/content/14/3/65.full.pdf}, journal = {BMJ Evidence-Based Medicine} }