1. Brigham and Women’s Hospital (A.B.G., E.C.M.), Boston, Massachusetts 02115
2. Harvard Medical School (A.B.G., E.C.M., M.B.-H., D.B.J., B.E.S., M.E.P.), Boston, Massachusetts 02115
3. Joslin Diabetes Center (A.B.G., E.D., R.B., M.B.-H., M.E.P.), Boston, Massachusetts 02215
4. Beth Israel Deaconess Medical Center (D.B.J., B.E.S.), Boston, Massachusetts 02215
5. Department of Medical Physiology (J.J.H.), The Panum Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark