1. Department of Process Machinery and Systems Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, 91058, Germany
2. Division of Phoniatrics and Pediatric Audiology at the Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Erlangen, Medical School, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, 91054, Germany