1. Internal Medicine, Saitama Medical Center, Jichi Medical University, Saitama 330-8503, Japan
2. Saitama Citizens Medical Center, Saitama 331-0054, Japan
3. Integrative Physiology, Jichi Medical University, Shimotsuke 329-0498, Japan
4. Nerima-Hikarigaoka Hospital, Tokyo 179-0072, Japan