1. Department of Radiology, Stony Brook University Medical Center, East Loop Rd, HSC Level 4, Rm 120, Stony Brook, NY 11794.
2. Department of Radiology, Brooke Army Medical Center, San Antonio, TX.
3. Uniformed Services University of the Health Sciences, Bethesda, MD.
4. Department of Otolaryngology, Brooke Army Medical Center, San Antonio, TX.