1. Department of Integrative Physiology, Gunma University Graduate School of Medicine, Maebashi 371-8511, Japan
2. Gunma University Heavy Ion Medical Center, Maebashi 371-8511, Japan
3. Department of Bioscience and Laboratory Medicine, Hirosaki University Graduate School of Health Science, Hirosaki 036-8564, Japan
4. Horie Hospital, Ota 373-8601, Japan