1. Department of Otolaryngology – Head and Neck Surgery, Thomas Jefferson University Hospital, Philadelphia, PA, USA
2. Department of Otolaryngology, University of Pittsburgh School of Medicine, UPMC Centers for Cranial Base Surgery & Sinonasal Disorders and Allergy, Pittsburgh, PA, USA
3. Department of Otolaryngology – Head and Neck Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA, USA