1. Division of Anesthesiology, Second Department of General Medicine, Saitama Medical Center, Jichi Medical University School of Medicine, Omiya 330-8503, Japan
2. Division of Complementary Medicine, First Department of General Medicine, Saitama Medical Center, Jichi Medical University School of Medicine, Omiya 330-8503, Japan
3. Department of Intergrated Physiology, Jichi Medical University School of Medicine, Shimotsuke 329-0498, Japan
4. Nerima Hikarigaoka Hospital, Tokyo 179-0072, Japan