1. Divisions of Otolaryngology and
2. Audiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA,
3. Boys Town National Research Hospital, Omaha, NE, USA,
4. National Center for Rehabilitative Auditory Research, Portland, OR, USA,
5. Oregon Health & Science University, Portland, OR, USA,
6. Pacific University, Forest Grove, OR, USA, and
7. Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA