1. Institute of Medicinal Plant Development Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100193 P. R. China
2. State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy Guizhou Medical University Guizhou 550025 P. R. China
3. National Institute of Drug Clinical Trial Guizhou Provincial People's Hospital Guizhou 550002 P. R. China