1 Department of Infectious Diseases, General Hospital of Ningxia Medical University, Ningxia 750004, China; Department of Infectious Diseases, The First Affiliated Hospital of Xi'an Jiaotong University, Shanxi 710061, China.
2 Department of Infectious Diseases, The First Affiliated Hospital of Xi'an Jiaotong University, Shanxi 710061, China. Electronic address: [email protected].
3 Department of Infectious Diseases, General Hospital of Ningxia Medical University, Ningxia 750004, China.