1 Division of Pediatrics, Department of Homeostatic Regulation and Development, Niigata University Graduate School of Medicine and Dental Science, Niigata, Japan.
2 Department of Pediatrics, National Hospital Organization, Kanazawa Medical Center, Kanazawa, Japan.
3 Department of Hematology, Endocrinology and Metabolism, Faculty of Medicine, Niigata University, Niigata, Japan.