Effectiveness of a nationwide intervention to increase helmet use in Dutch skiers and snowboarders: an observational cohort study
Ingrid Vriend, Arlette Hesselink, Ellen Kemler, Vincent Gouttebarge, Willem van Mechelen, Evert Verhagen
Injury Prevention Jun 2018, 24 (3) 205-212; DOI: 10.1136/injuryprev-2016-042179