1 Department of Infectious Disease, The Affiliated Hospital of Qingdao University, 266003, Qingdao, Shandong, China.
2 Department of Gastroenterology, The Affiliated Hospital of Qingdao University, No.16, Jiangsu Road, 266003, Qingdao, Shandong, China.
3 Department of Gastroenterology, The Affiliated Hospital of Qingdao University, No.16, Jiangsu Road, 266003, Qingdao, Shandong, China. [email protected].