1. Molecular Neurogenetics Unit, and Department of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129; and Department of Neurology, University of Cologne, D-50924 Cologne, Germany
2. Molecular Neurogenetics Unit, and Department of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129
3. Department of Obstetrics and Gynecology, Heinrich-Heine-University, D-40225 Düsseldorf, Germany
4. Neurosurgical Service, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129
5. Neurosurgical Service, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129; and Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129
6. Department of Surgery, Children's Hospital of Philadelphia, Philadelphia, PA 19104