1. Department of Respiratory Medicine, Center for Pathogen Biology and Infectious Diseases, Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education, The First Hospital of Jilin University, Changchun 130021, China
2. Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China
3. Department of Geriatrics, The Affiliated Hospital to Changchun University of Chinese Medicine, Changchun 130062, China
4. Department of Anaesthesia, Jilin Province People's Hospital, Changchun 130062, China
5. Department of Microbiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing 100191, China
6. Department of General Surgery, Qilu Hospital of Shandong University, Jinan 250012, Shandong, P.R. China