RT Journal Article SR Electronic T1 Misclassification of seat belt use JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP 91 OP 91 DO 10.1136/ip.9.1.91 VO 9 IS 1 A1 P Cummings A1 F P Rivara YR 2003 UL http://injuryprevention.bmj.com/content/9/1/91.1.abstract AB