1. Department of Otolaryngology–Head and Neck Surgery, Washington University School of Medicine in St Louis, St Louis, Missouri, USA
2. School of Medicine, University of South Carolina, Columbia, South Carolina, USA
3. Bernard Becker Medical Library, Washington University School of Medicine in St Louis, St Louis, Missouri, USA
4. Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology–Head and Neck Surgery, School of Medicine, Johns Hopkins University, Bethesda, Maryland, USA