@article {98, editor = {,}, title = {Purpose and procedure}, volume = {7}, number = {4}, pages = {98--98}, year = {2002}, doi = {10.1136/ebm.7.4.98}, publisher = {Royal Society of Medicine}, issn = {1356-5524}, URL = {https://ebm.bmj.com/content/7/4/98}, eprint = {https://ebm.bmj.com/content/7/4/98.full.pdf}, journal = {BMJ Evidence-Based Medicine} }