1 Department of Gastroenterology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, Shanxi, China.
2 Department of Neurosurgery, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, Yanta West Road, Xi'an, 710061, Shanxi, China.
3 Department of Pathology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, Shanxi, China.
4 Department of Gastroenterology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, Shanxi, China. Jun_3z@163.com.