Ahrens et al. 1991

Male laryngeal-cancer cases identified in one hospital in Bremen, Germany, in 1986 with histologic confirmation; male controls with nonneoplastic disease selected from same hospital and matched on age and residence

100 laryngeal

Berrino et al. 2003

Male cases of laryngeal and hypopharyngeal cancer, less than 55 yr old, diagnosed in six European centers in 1979-1982 with histologic confirmation; controls selected from census lists, electoral rolls, or population registries and matched for sex and age

215 laryngeal and 100 hypopharyngeal

Brown et al. 1988

White, male laryngeal-cancer cases, 30-79 yr old, diagnosed in 56 hospitals along Gulf Coast of Texas in 1975-1980; controls selected through Texas Department of Health mortality tapes, drivers license records, HCFA-provided Medicare records, and matched on age, vital status, ethnicity, county of residence

183 laryngeal