1. State Key Laboratory Breeding Base of Dao-di Herbs; National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences; Beijng 100700 China
2. School of Life Science; Beijing institute of technology; Beijing 100081 China
3. State Key Laboratory for Infectious Disease Prevention and Control (China CDC); Beijing 102206 People's Republic of China
4. National Institute of Communicable Diseases Control and Prevention and Control; Chinese Center for Disease Control and Prevention; Beijing 102206 People's Republic of China