[1] Univ Cincinnati, Div Occupat & Environm Med, Dept Environm Hlth, Pulm Div,Dept Internal Med,Coll Med, Cincinnati, OH 45267 USA
[2] Yale Univ, Sch Med, Yale Occupat & Environm Med, New Haven, CT USA
[3] NIOSH, Div Appl Res & Technol, Ctr Dis Control & Prevent, Cincinnati, OH 45226 USA
[4] US EPA, Risk Assessment Div, Off Chem Safety & Pollut Prevent, Washington, DC 20460 USA
[5] NIH, Off Clin Toxicol, Specialized Informat Serv, Natl Lib Med, Bethesda, MD 20892 USA
[6] NCI, Epidemiol & Genom Res Program, Div Canc Control & Populat Sci, Bethesda, MD 20892 USA
[7] Univ Arizona, Mel & Enid Zuckerman Coll Publ Hlth, Tucson, AZ USA
[8] Univ Rochester, Med Ctr, Rochester, NY 14627 USA
[9] Holland Associates, Palo Alto, CA USA
[10] UAW Hlth & Safety, Int Union, Detroit, MI USA
[11] Univ British Columbia, Dept Family Practice, Vancouver, BC V5Z 1M9, Canada
[12] Canadian Inst Relief Pain & Disabil, Vancouver, BC, Canada