Authors
Ling-Yun Zhang
Department of Gastroenterology, The Affiliated Hospital of Qingdao University, Qingdao, China
Hong Liang
The Community Healthcare Center of Yan’an’er Road, Qingdao, China
Xue-Guo Sun
Department of Gastroenterology, The Affiliated Hospital of Qingdao University, Qingdao, China