1. Department of Otolaryngology—Head & Neck Surgery Medical University of South Carolina Charleston South Carolina USA
2. Department of Otolaryngology—Head & Neck Surgery West Virginia University Morgantown West Virginia USA
3. Division of Biostatistics Medical University of South Carolina Charleston South Carolina USA
4. Department of Anesthesia and Perioperative Medicine Medical University of South Carolina Charleston South Carolina USA
5. Department of Anesthesiology Greenville Health System Greenville South Carolina USA