1. Department of Otolaryngology – Head & Neck Surgery Thomas Jefferson University Philadelphia Pennsylvania USA
2. Sidney Kimmel Medical College Thomas Jefferson University Philadelphia Pennsylvania USA
3. Department of Otolaryngology – Head and Neck Surgery The Ohio State University Columbus Ohio USA
4. Division of Biostatistics Thomas Jefferson University Philadelphia Pennsylvania USA
5. Department of Otolaryngology – Head & Neck Surgery Oregon Health & Science University Portland Oregon USA
6. Department of Otolaryngology – Head and Neck Surgery Louisiana State University Health Sciences Center New Orleans Louisiana USA