1. Department of Radiology, University of Uludag, Gorukle Mahallesi, Bursa, Turkey.
2. Department of Radiology, University of Minnesota Medical Center, Fairview, 420 Delaware St SE, B-226 Mayo Memorial Bldg, MMC 292, Minneapolis, MN 55455.
3. Department of Otolaryngology–Head and Neck Surgery, University of Minnesota Medical Center, Fairview, Minneapolis, MN.
4. Department of Pathology and Laboratory Medicine, University of Minnesota Medical Center, Fairview, Minneapolis, MN.