1. Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan
2. Department of Medicine and Biological Sciences, Gunma University Graduate School of Medicine, Maebashi, Japan
3. Department of Biochemistry, Faculty of Medicine Universitas Padjadjaran, Jatinangor, Indonesia
4. Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
5. Graduate School of Comprehensive Human Sciences International Institute for Integrative Sleep Medicine (WPI‐IIIS), Tsukuba, Japan