1. CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Molecular Virology and Center for Molecular Immunology, Institute of Microbiology, Chinese Academy of Science, Beijing
2. Department of Infectious Disease, China‐Japan Friendship Hospital, Beijing
3. Department of Gastroenterology, Beijing Youan Hospital, Capital Medical University, Beijing
4. Department of Gastroenterology, Beijing Friendship Hospital, Capital Medical University, Beijing, China