1. Department of Head and Neck Surgery; Loma Linda University; Loma Linda California
2. Department of Head and Neck Surgery; The Vancouver Clinic; Vancouver Washington U.S.A
3. Department of Radiology; Hennepin County Medical Center; Minneapolis Minnesota
4. Department of Head and Neck Surgery; Hennepin County Medical Center; Minneapolis Minnesota
5. Department of Head and Neck Surgery; University of Minnesota; Minneapolis Minnesota