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Barrett's esophagus is a metaplasia of the esophageal epithelium of any length, such that normal squamous epithelium is replaced by specialized columnar epithelium with goblet cells. It is important to diagnose and survey Barrett's esophagus because it is believed to be the major risk factor for development of esophageal adenocarcinoma. However, the prevalence of Barrett's esophagus in Korea is low. Mixed connective tissue disease (MCTD) is a systemic disorder in which patients havedoi:10.3904/kjm.2012.82.1.73 fatcat:hq5cqifbeng45oygnj2mrerm2q