1. Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan;
2. Department of Health Policy, National Centre for Child Health and Development, Tokyo, Japan;
3. Department of Laboratory Sciences, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan;
4. Department of Clinical and Laboratory Medicine, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan