1. Department of Otology and Laryngology, Harvard Medical School (Drs Benoit, McKenna, and Cunningham), Boston, MA
2. Department of Otolaryngology, Massachusetts Eye and Ear Infirmary (Drs Benoit, McKenna, and Cunningham), Boston, MA
3. Department of Pathology, Medical College of Wisconsin (Dr North), Milwaukee, WI
4. Department of Pathology, Massachusetts General Hospital (Drs Mihm and Johnson), Boston, MA