Kipen H M, Fiedler N
Division of Occupational Health, Environmental & Occupational Health Sciences Institute, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854, USA.
Am J Epidemiol. 1999 Jul 1;150(1):13-6; discussion 17. doi: 10.1093/oxfordjournals.aje.a009911.