1. Beijing Institute of Pharmacology & Toxicology, 27 Tai-Ping Road, Beijing 100850, China
2. Lindsley F. Kimball Research Institute, New York Blood Center, New York, New York 10065, United States
3. Natural Products Research Laboratories, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7568, United States
4. Duke University Medical Center, Box 2926, Surgical Oncology Research Facility, Durham, North Carolina 27710, United States
5. Chinese Medicine Research and Development Center, China Medical University and Hospital, Taichung, Taiwan