RT Journal Article SR Electronic T1 Still more on helmets: setting an example JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP 76 OP 77 DO 10.1136/ip.6.2.76 VO 6 IS 2 A1 I B Pless YR 2000 UL http://injuryprevention.bmj.com/content/6/2/76.abstract AB