1. Xi'an Medical University Xi'an Shaanxi Province China
2. State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases, Xijing Hospital of Digestive DiseasesAir Force Military Medical University Xi'an Shaanxi Province China
3. Division of General MedicineThe First Affiliated Hospital of Xi'an Medical University Xi'an Shaanxi Province China
4. Division of GastroenterologySecond Affiliated Hospital of Xi'an Jiaotong University Xi'an Shaanxi Province China