1. Molecular Otolaryngology Research Laboratories, Department of Otolaryngology - Head and Neck Surgery, Iowa City, IA 52242.
2. Molecular Otolaryngology Research Laboratories, Department of Otolaryngology-Head and Neck Surgery, Iowa City, IA 52242.
3. Boys Town National Research Hospital, Omaha, NE.
4. Department of Medical Genetics, 2610 Antwerp, Belgium.