1. Surgical Neurology Branch (R.R.L., J.J.W., H.L.D., E.H.O.), National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892
2. Program in Reproductive and Adult Endocrinology (L.K.N.), the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892
3. Department of Neurosurgery (R.J.W.), The Brain Tumor and Neuro-oncology Center, Cleveland Clinic Foundation, Cleveland, Ohio 44108
4. Department of Neurological Surgery (E.H.O.), University of Virginia Health Science Center, University of Virginia, Charlottesville, Virginia 22908