1. National Institute of Clinical Neurosciences, Budapest, Hungary
2. Department of Neurological Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota
3. Department of Anatomic Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota
4. Department of Otorhinolaryngology, Mayo Clinic College of Medicine, Rochester, Minnesota
5. Department of Radiation Oncology, Mayo Clinic College of Medicine, Rochester, Minnesota