[1] Wake Forest Sch Med, Ctr Worker Hlth, Dept Family & Community Med, Winston Salem, NC 27157 USA
[2] Wake Forest Sch Med, Ctr Worker Hlth, Dept Neurol, Winston Salem, NC 27157 USA
[3] Wake Forest Sch Med, Ctr Worker Hlth, Dept Biostat Sci, Div Publ Hlth Sci, Winston Salem, NC 27157 USA
[4] Wake Forest Sch Med, Ctr Worker Hlth, Dept Epidemiol & Prevent, Div Publ Hlth Sci, Winston Salem, NC 27157 USA