1. Infectious Diseases Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117545
2. Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117545
3. Department of Otolaryngology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597
4. College of Art and Sciences, Cornell University, Ithaca, NY 14853
5. Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593