TY - JOUR T1 - Basal skull fracture and the halo sign JF - Canadian Medical Association Journal JO - CMAJ SP - 416 LP - 416 DO - 10.1503/cmaj.120055 VL - 185 IS - 5 AU - Ravi Sunder AU - Kevin Tyler Y1 - 2013/03/19 UR - http://www.cmaj.ca/content/185/5/416.abstract N2 - ER -