1. Department of Otolaryngology–Head and Neck SurgeryUniversity of Toronto, St. Michael's Hospital Toronto Ontario Canada
2. Health Sciences Library System (HSLS), Research, Instruction, and Clinical Information Services DepartmentUniversity of Pittsburgh Pittsburgh Pennsylvania
3. UCSF Voice and Swallowing Center, Department of Otolaryngology–Head and Neck SurgeryUniversity of California San Francisco, San Francisco California U.S.A.