1. Biostatistics and Epidemiology Service, The New York Eye and Ear Infirmary, New York, New York.
2. Department of Otolaryngology, The New York Eye and Ear Infirmary, New York, New York.
3. New York Medical College, Valhalla, New York.
4. Department of Pathology, The New York Eye and Ear Infirmary, New York, New York.