1. Division of Phoniatrics and Pediatric Audiology at the Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Erlangen, Medical School at Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstrasse 1, 91054 Erlangen, Germany
2. Laryngeal Dynamics Laboratory, Department of Head and Neck Surgery, David Geffen School of Medicine, UCLA, Los Angeles, California 90024, USA