RT Journal Article SR Electronic T1 Meta JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP 233 OP 233 DO 10.1136/ip.3.3.233-a VO 3 IS 3 A2 I B Pless YR 1997 UL http://injuryprevention.bmj.com/content/3/3/233.2.abstract AB