@article {316, editor = {,}, title = {EMQ answers256}, volume = {25}, number = {5}, pages = {316--316}, year = {2008}, publisher = {British Association for Accident and Emergency Medicine}, issn = {1472-0205}, URL = {https://emj.bmj.com/content/25/5/316}, eprint = {https://emj.bmj.com/content/25/5/316.full.pdf}, journal = {Emergency Medicine Journal} }