1. Department of Otorhinolaryngology; Head & Neck Surgery, Yan Chai Hospital; Hong Kong Special Administrative Region People's Republic of China
2. Department of Microbiology; Faculty of Medicine, The Chinese University of Hong Kong; Hong Kong Special Administrative Region People's Republic of China
3. Jockey Club School of Public Health and Primary Care; Faculty of Medicine, The Chinese University of Hong Kong; Hong Kong Special Administrative Region People's Republic of China
4. Department of Anatomical and Cellular Pathology; Faculty of Medicine, The Chinese University of Hong Kong; Hong Kong Special Administrative Region People's Republic of China