1. Department of Physiology, School of Medicine, Kanazawa University, 13‐1 Takara‐machi, Kanazawa 920‐8640, Japan
2. Department of Physiology, School of Medicine, Shimane Medical University, 89‐1, Enya‐cho, Izumo 693‐8501, Japan
3. Department of Physiology, School of Allied Health Sciences, Osaka University Faculty of Medicine, Suita 565‐0871, Japan