RT Journal Article SR Electronic T1 Accounting for vehicle, crash, and occupant characteristics in traffic crash studies JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP 363 OP 366 DO 10.1136/ip.2009.025163 VO 16 IS 6 A1 Cummings, Peter A1 McKnight, Barbara YR 2010 UL http://injuryprevention.bmj.com/content/16/6/363.abstract AB