1. Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117545, Singapore
2. Immunology Programme, the Life Science Institute, National University of Singapore, Singapore 117597, Singapore
3. Department of Otorhinolaryngology, the First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, China
4. Department of Otolaryngology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
5. Department of Pathology, National University Hospital, Singapore 119074, Singapore