1. Loma Linda University School of Medicine, Loma Linda University Medical Center, California, USA.
2. University of Nevada, Reno School of Medicine, Reno, Nevada, USA.
3. Department of Otolaryngology–Head and Neck Surgery, Loma Linda University Medical Center, California, USA.
4. Department of Pathology, Loma Linda University Medical Center, Loma Linda, California, USA.