1. Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan
2. Department of Medicine, Mackay Medical College, New Taipei City 252, Taiwan
3. National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei 112, Taiwan
4. Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan
5. Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan