1. Department of clinical pharmacy, Guangzhou First People's Hospital, South China University of Technology, Guangzhou 510180, P.R. China
2. School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, P.R. China
3. Tea Research Institute, Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of Tea Resources Innovation & Utilization, Guangzhou 510640, China