1 Key Laboratory of Digestive Diseases of Anhui Province, Department of Gastroenterology, the First Affiliated Hospital of Anhui Medical University, 218 Jixi Road, Shushan District, Hefei, 230022, Anhui Province, China.
2 Key Laboratory of Digestive Diseases of Anhui Province, Department of Gastroenterology, the First Affiliated Hospital of Anhui Medical University, 218 Jixi Road, Shushan District, Hefei, 230022, Anhui Province, China. kongderun@ahmu.edu.cn.