1. Departments of Anatomy and Neurobiology (M.A.P., R.F.H.), Boston University School of Medicine, Boston, Massachusetts 02118
2. Departments of Urology (I.G., A.M.T.), Boston University School of Medicine, Boston, Massachusetts 02118
3. Institute for Sexual Medicine, and Department of Biochemistry (A.M.T.), Boston University School of Medicine, Boston, Massachusetts 02118