1 Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02115.
2 Department of Endocrinology, Hematology, and Gerontology, Graduate School of Medicine, Chiba University, 260-8670 Chiba, Japan.
3 Department of Molecular Diagnosis, Graduate School of Medicine, Chiba University, 260-8670 Chiba, Japan.