[1] Wake Forest Sch Med, Dept Family & Community Med, Winston Salem, NC 27157 USA
[2] Wake Forest Sch Med, Ctr Worker Hlth, Winston Salem, NC 27157 USA
[3] Wake Forest Sch Med, Dept Epidemiol & Prevent, Winston Salem, NC 27157 USA
[4] Wake Forest Sch Med, Dept Biostat Sci, Winston Salem, NC 27157 USA
[5] Virginia Polytech Inst & State Univ, Virginia Tech, Myers Lawson Sch Construct, Blacksburg, VA 24061 USA
[6] Virginia Tech, Occupat Safety & Hlth Res Ctr, Blacksburg, VA USA
[7] Virginia Tech, Dept English, Blacksburg, VA USA