RT Journal Article SR Electronic T1 Continuity and change JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP 1 OP 1 DO 10.1136/ip.2007.017897 VO 14 IS 1 A1 Brian D Johnston YR 2008 UL http://injuryprevention.bmj.com/content/14/1/1.abstract AB