1. Division of Endocrinology (D.M.A.), Takasaki 370-1295, Japan
2. Pharmaceutical Research Laboratory (T.Y.), Kirin Brewery Co. Ltd., Takasaki 370-1295, Japan
3. Department of Medicine, and Division of Pediatric Nephrology (A.A.P.), Takasaki 370-1295, Japan Department of Pediatrics, University of California, San Francisco, California 94143-0748