nitrosamine carcinogenesis in 5120 rodents : chronic administration of sixteen different concentrations of ndea , ndma , npyr and npip in the water of 4440 inbred rats , with parallel studies on ndea alone of the effect of age of starting ( 3 , 6 or 20 weeks ) and of species ( rats , mice or hamsters ) .
C0028197
nitrosamine
C0012200
ndea