PT - JOURNAL ARTICLE AU - Ben Fine AU - Navneet Singh AU - Richard Aviv AU - R. Loch Macdonald TI - Does a patient with a thunderclap headache need a lumbar puncture? AID - 10.1503/cmaj.110517 DP - 2012 Mar 20 TA - Canadian Medical Association Journal PG - 555--556 VI - 184 IP - 5 4099 - http://www.cmaj.ca/content/184/5/555.short 4100 - http://www.cmaj.ca/content/184/5/555.full SO - CMAJ2012 Mar 20; 184