1. Department of Pharmacology, School of Medicine, Fukushima Medical University, Fukushima 960‐1295
2. Department of Molecular and Cellular Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya 467‐8603, Japan
3. Department of Ecology and Clinical Therapeutics, School of Nursing, Fukushima Medical University, Fukushima 960‐1295