[1] NIOSH, Cincinnati, OH 45226 USA
[2] NCI, Rockville, MD USA
[3] Columbia Univ, New York, NY USA
[4] NIEHS, Res Triangle Pk, NC 27709 USA
[5] NIH, Rockville, MD USA
[6] NIOSH, Morgantown, WV USA
[7] United Auto Workers Union, Detroit, MI USA
[8] Natl Inst Canc Res, Genoa, Italy