Three theses.
D004430:Ear Protective Devices; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control*; D006801:Humans; D007822:Laryngeal Neoplasms / Q000601:surgery*; D007825:Laryngectomy / Q000379:methods; D008443:Maxillary Sinus / Q000601:surgery*; D012852:Sinusitis / Q000601:surgery*