1. Departments of Internal Medicine & Pharmacology (N.A.H., K.L.P.) Gynecology University of Texas Southwestern Medical Center Dallas, Texas 75390-8857
2. School of Biochemistry & Genetics (N.A.H., D.I.W.) University of Newcastle Newcastle upon Tyne, United Kingdom
3. Division of Reproductive Endocrinology (W.E.R.) Department of Obstetrics & Gynecology University of Texas Southwestern Medical Center Dallas, Texas 75390-8857
4. Department of Medicine (D.I.W., S.G.B.) University of Newcastle Newcastle upon Tyne, United Kingdom