Beginning a career in pediatric hematology: 1926.
D002321:Career Choice; D002641:Chicago; D002648:Child; D004501:Education, Medical / Q000266:history; D004739:England; D006405:Hematology / Q000266:history*; D049673:History, 20th Century; D006776:Hospitals, Pediatric / Q000266:history; D006801:Humans; D007396:Internship and Residency / Q000266:history; D007938:Leukemia / Q000266:history; D010372:Pediatrics / Q000266:history*; D014481:United States