1. Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, Maebashi 371-8511, Japan
2. Gunma University Health and Medical Center, Gunma 371-8511, Japan
3. Department of Metabolic Preemptive Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
4. Kitakanto obesity and metabolic research institute, Gunma 379-2311, Japan
5. Tottori University Faculty of Medicine, Tottori 683-8503, Japan