1. Departments of Endocrinology and Metabolic Diseases (O.M.D., A.M.P., F.R., M.A.S., J.W.A.S., J.A.R.), 2300 RC Leiden, The Netherlands
2. Neurosurgery (J.H.C.V.), 2300 RC Leiden, The Netherlands
3. Radiotherapy (K.J.N.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands