1. Audiology and Phoniatrics Charité‐University Medicine Berlin Berlin Germany
2. Department of Otorhinolaryngology University Medical Center Bonn (UKB) Bonn Germany
3. Department of Phoniatrics and Pedaudiology University Hospital Münster University of Münster Münster Germany
4. Department of Medical Biometry Informatics and Epidemiology University Hospital Rheinische Friedrich‐Wilhelms‐University Bonn Germany
5. ENT and phoniatrics Berlin Germany