[1] Wake Forest Sch Med, Dept Epidemiol & Prevent, Div Publ Hlth Sci, Winston Salem, NC USA
[2] Wake Forest Sch Med, Ctr Worker Hlth, Winston Salem, NC USA
[3] Lawrence Univ, Anthropol Dept, Appleton, WI 54912 USA
[4] North Carolina Farmworkers Project, Benson, NC USA
[5] Meharry Med Coll, Dept Family & Community Med, Nashville, TN 37208 USA
[6] Wake Forest Sch Med, Dept Biostat Sci, Div Publ Hlth Sci, Winston Salem, NC USA
[7] Wake Forest Sch Med, Dept Family & Community Med, Winston Salem, NC USA