Affiliation: | Ting-Ting Wang, Jia-Jun He, Department of Gastroenterology, The First Clinical Medical College, Dalian Medical University, Dalian 116044, Liaoning Province, ChinaJun Liu, Wei-Wei Chen, Chao-Wu Chen, Endoscopy Center, Department of Gastroenterology, Clinical Medical College, Yangzhou University, Yangzhou 225009, Jiangsu Province, China |