1. Department of Statistics (D.M.K.), University of Virginia, Charlottesville, Virginia 22904
2. Department of Physiology (I.J.C.), Prince Henry's Institute of Medical Research, Clayton VIC 3168, Australia
3. Departments of Medicine and Physiology (J.D.V.), Endocrine Research Unit and Biophysics Section, Mayo School of Graduate Medical Education, Clinical Translational Science Center, Mayo Clinic, Rochester, Minnesota 55905