1 From the ∗Department of Gastroenterology, Qilu Hospital(Qingdao), Cheeloo College of Medicine, Shangdong University, 758 Hefei Road, Qingdao, Shangdong, China.
2 Department of Pathology, Qilu Hospital(Qingdao), Cheeloo College of Medicine, Shangdong University, 758 Hefei Road, Qingdao, Shangdong, China.