TY - JOUR T1 - Does a patient with a thunderclap headache need a lumbar puncture? JF - Canadian Medical Association Journal JO - CMAJ SP - 555 LP - 556 DO - 10.1503/cmaj.110517 VL - 184 IS - 5 AU - Ben Fine AU - Navneet Singh AU - Richard Aviv AU - R. Loch Macdonald Y1 - 2012/03/20 UR - http://www.cmaj.ca/content/184/5/555.abstract ER -