2Hoffman HT,Karnel LH,Shah JP,et al.Hypopharyngeal cancer patient care evaluation.Laryngoscope,1997,107(8):1005-1017
3Spector JG,Sessions DG,Hanghey BH,et al.Delayed regional metastases and second primary malignancies in squamous cell carcinomas of the larynx and hypopharynx.Laryngscop,2001,11(16):1079-1087
4Zbaren P,Becker M,Lang H.Pretherapeutic staging of hypopharyngeal carcinoma.Arch Otolaryngol Head Neck Surg,1997,123(8):908-913