1. Division of Endocrinology, Department of Medicine, Baylor College of Medicine (M.M., S.D., D.I., A.R., A.B.), Houston, Texas 77030
2. Endocrine Service, Ben Taub General Hospital (M.M., L.R., A.B.), Houston, Texas 77030
3. Robert J. Williams Laboratory, Department of Medicine, University of Washington School of Medicine (C.S.H., L.K.G., L.P.H., Å.L.), Seattle, Washington 98195
4. Puget Sound Blood Center (L.K.G., D.B.), Seattle, Washington 98195