RT Journal Article SR Electronic T1 Precautionary principle JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP 285 OP 285 DO 10.1136/ip.9.3.285 VO 9 IS 3 A1 Li, G YR 2003 UL http://injuryprevention.bmj.com/content/9/3/285.1.abstract AB