TY - JOUR T1 - Mandatory ski helmets? JF - Canadian Medical Association Journal JO - CMAJ SP - 942 LP - 942-a DO - 10.1503/cmaj.110-2072 VL - 182 IS - 9 AU - Gerhard Ruedl AU - Martin Kopp AU - Martin Burtscher Y1 - 2010/06/15 UR - http://www.cmaj.ca/content/182/9/942.2.abstract ER -