1. Faculty of Pharmaceutical Sciences; Nagasaki International University; 2825-7 Huis Ten Bosch Sasebo Nagasaki 859-3298 Japan
2. Department of Pathology and Laboratory Medicine; Boston University School of Medicine; Boston MA 02118 USA
3. Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden; Chinese Academy of Sciences; Guangzhou 510650 China
4. Faculty of Pharmaceutical Sciences; Khon Kaen University; Khon Kaen 40002 Thailand
5. Department of Pharmacognosy, Graduate School of Pharmaceutical Sciences; Kyushu University; 3-1-1 Maidashi, Higashi-ku Fukuoka 812-8582 Japan