Abstract in English

References used

1. Essential,K.J.Lee,MD,FACS. Otolaryngology-Head and Neck Surgery, 9th edition ,2010. Cancer of larynx ;27(596)
Cummings CW, Fredrickson JM, Harker LA,et,eds.Otolaryngology-Head and Neck Surgery, 5th edition . Vol 3 .St.Louis ; Mosby,2010
Scott-Brown's Otorhinolaryngology, Head and Neck Surgery 7th edition 2008

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