1. Institute of Natural Medicine, University of Toyama, Sugitani, Toyama 930-0194, Japan
2. Graduate School of Science, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan
3. Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
4. Faculty of Pharmacy, Osaka Ohtani University, Tondabayashi, Osaka 584-8540, Japan
5. School of Pharmacy, Iwate Medical University, Yahaba, Iwate 028-3694, Japan