1. School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P.R. China
2. State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, P.R. China