1. Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung 807, Taiwan, Republic of China
2. Cancer Center, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan, Republic of China
3. Department of Forestry, National Chung-Hsing University, Taichung 402, Taiwan, Republic of China
4. Graduate Institute of Natural Products, Chang Gung University, Taoyuan 333, Taiwan, Republic of China
5. Natural Medicinal Products Research Center and Center for Molecular Medicine, China Medical University Hospital, Taichung 40402, Taiwan, Republic of China
6. Graduate Institute of Integrated Medicine, College of Chinese Medicine, China Medical University, Taichung 40402, Taiwan, Republic of China