1. Department of Oral Pathology, Radiology and Medicine, College of Dentistry, The University of Iowa, Iowa City, IA, USA
2. Department of Otolaryngology, Caver College of Medicine, The University of Iowa, Iowa City, IA, USA
3. Department of Pathology, Caver College of Medicine, The University of Iowa, Iowa City, IA, USA
4. Department of Radiology, Caver College of Medicine, The University of Iowa, Iowa City, IA, USA