1. Auditory Physiology and Psychoacoustics Research Laboratory; duPont Hospital for Children; Wilmington Delaware U.S.A.
2. Department of Otolaryngology-Head and Neck Surgery; Thomas Jefferson University Hospital; Philadelphia U.S.A.
3. Department of Audiology; duPont Hospital for Children; Wilmington Delaware U.S.A.
4. Department of Biology; Swarthmore College; Swarthmore Philadelphia U.S.A.
5. Department of Biology and Biological Foundations of Behavior Program; Franklin and Marshall College; Philadelphia U.S.A.
6. Lancaster General Hospital; Lancaster Philadelphia U.S.A.
7. Department of Otolaryngology-Head and Neck Surgery; duPont Hospital for Children; Wilmington Delaware U.S.A.
8. Department of Pediatrics; Thomas Jefferson University Hospital; Philadelphia U.S.A.
9. Clinic for Special Children; Strasburg Pennsylvania U.S.A.