[1] Johns Hopkins Univ, Sch Med, Dept Emergency Med, Baltimore, MD 21209 USA
[2] Univ Washington, Dept Rehabil Med, Seattle, WA 98195 USA
[3] Ctr Dis Control & Prevent, Natl Ctr Injury Prevent & Control, Atlanta, GA USA
[4] Med Univ S Carolina, Dept Biometry & Epidemiol, Charleston, SC 29425 USA
[5] Med Univ S Carolina, Dept Psychiat & Behav Sci, Charleston, SC 29425 USA
[6] Ralph H Johnson Dept Vet Affairs Med Ctr, Mental Hlth Serv, Charleston, SC USA