1. Department of Infectious Diseases, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
2. Central Laboratory, Shaanxi Provincial Infectious Diseases Hospital and Xi'an Eighth Hospital Affiliated to Xi'an Jiaotong University Health Science Center, Xi'an, China.
3. Department of Internal Medicine, No. 1 Hospital of Xi'an, Xi'an, China.
4. Molecular Medicine Center, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
5. Department of Gastroenterology, Xi'an Zhongxin Hospital, Xi'an, China.
6. Department of Infectious Diseases, No. 3 People's Hospital Affiliated to Medical College, Shanghai Jiaotong University, Shanghai, China.