Institute of Medicine, Chung Shan Medical University, Taichung 40242, Taiwan, China
Division of Gastroenterology, Department of Internal Medicine, Taichung Veterans General Hospital,Taichung 40242, Taiwan, China
Department of Medicine, Chung Shan Medical University, Taichung 40242, Taiwan, China
Department of Medicine, Chung Medical University, Taichung 40242, Taiwan, China
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