1. Department of Medicinal and Applied Chemistry, College of Life Sciences, Kaohsiung Medical University, Kaohsiung 807, Taiwan
2. Department of Physiology, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
3. Institute of Medical Science and Technology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
4. Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan