About the Authors

Peter Birkholz


Affiliation Department of Phoniatrics, Pedaudiology, and Communication Disorders, University Hospital Aachen and RWTH Aachen University, Aachen, Germany

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PB. Performed the experiments: PB. Analyzed the data: PB. Contributed reagents/materials/analysis tools: PB. Wrote the paper: PB.