M. Campbell, G. Piaggio, D. Elbourne, und D. Altman. BMJ (Clinical research ed.), (Januar 2012)6930<m:linebreak></m:linebreak>JID: 8900488; epublish;<m:linebreak></m:linebreak>Publicació; RCT; Dissenys de cluster.
C. Coupland, und C. DiGuiseppi. Injury prevention : journal of the International Society for Child and Adolescent Injury Prevention, 16 (2):
132-6(April 2010)5737<m:linebreak></m:linebreak>JID: 9510056; ppublish;.