Isidore Snapper (1889-1973) and quantitative assay of fecal hemoglobin.
D006418:Heme / Q000032:analysis*; D049673:History, 20th Century; D006801:Humans; D009426:Netherlands; D009780:Occult Blood; D011166:Porphyrins / Q000032:analysis*
D011166:Porphyrins; D006418:Heme