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Department of Clinical Cell Biology and Medicine (I.S., S.H., M.F., T.Tak., A.T.,
T.K., E.K., A.S., H.N., N.H., S.S., T.M., H.K., K.Y., T.Tan.), Graduate School of
Medicine, Chiba University, Chiba 260-8670, Japan; Division of Diabetes, Endocrinology,
and Metabolism (I.S., S.H., M.F., T.Tak., A.T., T.K., E.K., A.S., H.N., N.H., S.S.,
T.M., H.K., K.Y., T.Tan.), Chiba University Hospital, Chiba 260-8670, Japan; Department
of Pathology (K.O., H.S.), Tohoku University Graduate School of Medicine, Sendai City,
Miyagi 980-8575, Japan; and Center for Diabetes, Metabolism, and Endocrinology (I.T.),
Toho University Sakura Medical Center, Sakura, Chiba 285-0841, Japan.