[1] Univ Colorado, Sch Med, Denver Hlth Occupat Hlth & Safety, Dept Prevent Med & Biometr, Boulder, CO 80309 USA
[2] Univ New Mexico, Sch Med, Dept Internal Med, New Mexico Occupat Hlth Reg, Albuquerque, CO USA
[3] Univ New Mexico, Sch Med, Ctr Injury Prevent Res & Educ, Dept Emergency Med, Albuquerque, CO USA
[4] Univ New Mexico, Sch Med, Dept Internal Med, Program Occupat & Environm Hlth, Albuquerque, CO USA