1. Cancer Statistics, 1989;Silverberg;CA,1989
2. Toward the prevention of laryngeal cancer;Wydner;Laryngoscope,1975
3. Cancer of the larynx;Lawson,1981
4. Solid neoplasms;Rickel,1982
5. The comparison of reusable and disposable inner cannula tracheostomy tubes;Sievers;Soc Otorhinolaryngol Head Neck Nurs J,1988