1. USC Caruso Department of Otolaryngology–Head & Neck Surgery, Keck School of Medicine of USC, California, USA
2. Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
3. Keck School of Medicine of USC, Los Angeles, California, USA
4. Health Sciences Libraries, Keck School of Medicine of USC, Los Angeles, California, USA