1. Department of Neurosurgery; Mayo Clinic; Rochester Minnesota
2. International Clinical Research Center, St. Anne's University Hospital Brno; Brno Czech Republic
3. Department of Surgery; Emory University School of Medicine; Atlanta Georgia
4. Department of Radiology; Mayo Clinic; Rochester Minnesota
5. Department of Surgical Pathology; Mayo Clinic; Rochester Minnesota
6. Division of Colon & Rectal Surgery; Mayo Clinic; Rochester Minnesota