1. Department of Infectious Diseases and Hepatology The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China
2. Department of Infectious Diseases Luohe Central Hospital Luohe Henan China
3. Department of Infectious Diseases Sanmenxia Central Hospital Sanmenxia Henan China
4. Department of Obstetrics The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China
5. Department of Clinical Laboratory The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China
6. Department of Infectious Diseases The Second Affiliated Hospital of Xi'an Jiaotong University Xi'an Shaanxi China