1. Second Department of Internal Medicine, National Defense Medical College, Saitama, Japan
2. Department of Internal Medicine, National Saitama Hospital, Saitama, Japan
3. Internal Medicine, Keio University, School of Medicine, Tokyo, Japan
4. Department of Medical Biochemistry, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
5. Department of Bioregulation, Biomedical Research Center, Osaka University Medical School, Osaka, Japan