Chiron's contributions.
D006258:Head and Neck Neoplasms / Q000601:surgery; D049673:History, 20th Century; D006801:Humans; D037981:Neck Dissection / Q000266:history; D010036:Otolaryngology / Q000266:history*; D012955:Societies, Medical / Q000266:history; D014481:United States