The CENTERS Antwerp University Hospital Bauru Hospital for rehabilitation of Cranio-facial Anomalies Beijing Tongren Hospital Bern Inselspital Bochum St. Elisabeth University Hospital Bradford Yorkshire Auditory Implant Service Calicut ENT Super Speciality Institute and Research Center Chapel Hill The University of North Carolina at Chapel Hill School of Medicine Chennai MadrasENT Research Foundation Columbus The Ohio State University Wexner Medical Center Córdoba Sanatorium Allende Frankfurt ENT University Hospital Innsbruck ENT University Hospital Innsbruck HSS University Hospital Kansas University Center for Hearing and Balance Disorders London CANADA Health Sciences Center Luzern HNO-Klinik Kantonspital Madrid Hospital La Paz Manchester Central Manchester University Hospitals Matsumoto Shinshu University School of Medicine Munich University Hospital ENT Oldenburg Evangelic Hospital Perth Ear Science Institute Australia Perth Fiona Stanley Hospital Rennes Centre Hospitalier Universitaire Riyadh King Abdullah EarSpecialist Center Rostock University Medical Center St. Petersburg ENT and Speech Research Institute St. Pölten University Hospital Stockholm Karolinska University Hospital Vienna ENT University Hospital Warsaw Institute of Physiology and Pathology of Hearing Würzburg ENT University Hospital