1. Department of Vascular Biology, Institute of Brain Science, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
2. Department of Gastroenterology and Hematology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
3. Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
4. Department of Bioscience and Laboratory Medicine, Hirosaki University Graduate School of Health Science, Hirosaki, Aomori 036-8564, Japan
5. Division of Pharmacognosy, Tohoku Medical and Pharmaceutical University, Sendai, Miyagi 981-8558, Japan