1. Department of Microbiology, The Prince of Wales Hospital and The Chinese University of Hong Kong, Hong Kong
2. Division of Immunity and Infection, University of Birmingham, Birmingham, United Kingdom
3. Department of Infectious Diseases, The First Affiliated Hospital of Zhejiang University, Zhejiang, People's Republic of China
4. Microbiology, The First Municipal People's Hospital of Guangzhou, Guangzhou, People's Republic of China