Cricothyroidotomy revisited again.
D003413:Cricoid Cartilage / Q000601:surgery*; D049673:History, 20th Century; D006801:Humans; D007817:Laryngeal Cartilages / Q000601:surgery*; D013957:Thyroid Cartilage / Q000601:surgery*; D014140:Tracheotomy / Q000266:history / Q000379:methods; D014481:United States