[1] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA
[2] Columbia Univ, Vagelos Coll Phys & Surg, Dept Anesthesiol, New York, NY USA
[3] Columbia Univ Irving, Med Ctr, Ctr Injury Sci & Prevent, New York, NY USA
[4] Columbia Univ, Vagelos Coll Phys & Surg, Dept Psychiat, New York, NY USA
[5] Columbia Univ, Mailman Sch Publ Hlth, Dept Biostat, New York, NY USA
[6] Univ Colorado, Sch Med, Dept Emergency Med, Aurora, CO 80045 USA
[7] VA Eastern Colorado Geriatr Res Educ & Clin Ctr, Aurora, CO USA
[8] Univ Colorado Anschutz Med Campus, Colorado Sch Publ Hlth, Dept Epidemiol, Aurora, CO USA
[9] Univ Michigan, Transportat Res Inst, Ann Arbor, MI USA
[10] Univ Calif San Diego, Sch Publ Hlth, La Jolla, CA USA
[11] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Hlth Behav & Soc, Baltimore, MD USA
[12] Bassett Res Inst, Cooperstown, NY USA
[13] Columbia Univ, Vagelos Coll Phys & Surg, 622 168th St,PH5-505, New York, NY 10032 USA