1. State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou 510060, People's Republic of China.
2. Institute of Otorhinolaryngology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, People's Republic of China.
3. Guangzhou Doublle Bioproducts, Science Park, Guangzhou 510663, People's Republic of China.
4. Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101 People's Republic of China.