2Debeljak A.Sorli J,Music E,et al.Bronehoseopic removal of foreign bodies in adults;experience with 62 patients from 1974-1998.Eur Respir J,1999,14:792-795.
3Athanassiadi K,Kalavrouziotis G,Lepenos V,et al.Management of foreign bodies in the tracheobmnchial tree in adults:a 10-year expefenee.Eur J Surg,2000,166:920-923.
4Kendall K A,Lonard R L.Bolus transit and airway protection coordination in olderdysphagic patients.Laryoscope.2001.111:2017-2021.