1. Department of Infectious Diseases and Hepatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, P.R. China
2. Department of Infectious Diseases, The Sixth People’s Hospital of Zhengzhou City, Zhengzhou, P.R. China
3. Department of Respiratory and Critical Care Medicine, The Zhengzhou First People’s Hospital, Zhengzhou, P.R. China
4. Department of Ultrasound, Shangqiu First People’s Hospital, Shangqiu, P.R. China
5. Department of Respiration, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, P.R. China
6. Department of Clinical Laboratory & Key Clinical Laboratory of Henan province, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, P.R. China