@article {97, editor = {,}, title = {Purpose and procedure}, volume = {10}, number = {4}, pages = {97--97}, year = {2005}, doi = {10.1136/ebm.10.4.97}, publisher = {Royal Society of Medicine}, issn = {1356-5524}, URL = {https://ebm.bmj.com/content/10/4/97}, eprint = {https://ebm.bmj.com/content/10/4/97.full.pdf}, journal = {BMJ Evidence-Based Medicine} }