1. Department of Otolaryngology–Head and Neck Surgery University of Michigan Health System Ann Arbor Michigan USA
2. Department of Otolaryngology–Head and Neck Surgery University of Iowa Hospitals & Clinics Iowa City Iowa USA
3. ProMedica Physicians Ear, Nose and Throat—Sylvania Sylvania Ohio USA
4. Department of Pathology University of Michigan Health System Ann Arbor Michigan USA
5. Department of Otolaryngology–Head and Neck Surgery University of Pittsburgh Pittsburgh Pennsylvania USA