1. Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, Zhejiang 310008, P. R. China
2. School of Food and Biological Engineering, Shaanxi University of Science & Technology, Xi’an 710021, P. R. China
3. Tea Research Institute, Hunan Academy of Agricultural Sciences, Changsha, Hunan 410125, P. R. China
4. Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, Zhejiang 310051, P. R. China