International Centers Ear Science Institute Lions Hearing ClinicAustralia Servicio ORL Sanatorio AllendeArgentina Medical University of Vienna Universitätsklinik für Hals-, Nasen- und OhrenkrankheitenAustria Innsbruck University Hospital The Department of Hearing Voice, and Language Disorders (HSS)Austria Universitätsklinik für Hals- Nasen- Ohrenheilkunde InnsbruckAustria Karl Landsteiner University HospitalAustria Antwerp University HospitalBelgium Hospital de Reabilitação das Anomalias Cranio-FaciaisBrasil London Health Sciences CentreCanada Capital Medical University Beijing Tongren HospitalChina Hospital de Reabilitação das Anomalias Cranio-FaciaisColombia CHU - Centre Hospitalier Universitaire de RennesFrance Klinik und Poliklinik für Hals-, Nasen und Ohren- Krankheiten, Universität WürzburgGermany Rostock University Medical Center Dept. of Oto-Rhino-Laryngology, Head and Neck Surgery, ”Otto Körner“Germany Madras ENT Research Foundation (MERF)India ENT Super Speciality Institute and Research CenterIndia Shinshu University School of MedicineJapan Institute of Physiology and Pathology of HearingPoland Universitätsklinik für HNO, Kopf- und Halschirurgie, Inselspital BernSwitzerland Bradford Royal Infirmary Yorkshire Auditory Implant CentreUnited Kingdom Central Manchester University Hospitals, Manchester Auditory Implant Centre United Kingdom Kansas University Center for Hearing and Balance DisordersUnited States of America UNC Ear & Hearing Center at Chapel Hill School of MedicineUnited States of America Ohio State Medical CenterUnited States of America