Transnasal esophagoscopy

http://www.medworm.com/index.php?rid=6142516&cid=u_0_16_f&fid=38696&url=http%3A%2F%2Fwww.optecoto.com%2Farticle%2FPIIS1043181011001394%2Fabstract%3Frss%3Dyes

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