1. The First Affiliated Hospital of Xi’an Jiao Tong University, Xi’an, People’s Republic of China
2. Department of Gastroenterology, Shaanxi Provincial People’s Hospital, Xi’an, People’s Republic of China
3. Department of Gastroenterology, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, People’s Republic of China
4. Department of Hematology, The First Affiliated Hospital of Xi’an Jiao Tong University, Xi’an, People’s Republic of China