Contributions of Philadelphia to early laryngology.
D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007822:Laryngeal Neoplasms / Q000266:history; D010036:Otolaryngology / Q000193:education / Q000266:history*; D010038:Otorhinolaryngologic Diseases / Q000266:history; D010414:Pennsylvania; D012577:Schools, Medical / Q000266:history; D012955:Societies, Medical / Q000266:history