1. Department of Teleaudiology and Screening, World Hearing Center, Institute of Physiology and Pathology of Hearing, Warsaw, Poland
2. Department of Market Analysis and Marketing Research, Faculty of Management, Cracow University of Economics, Cracow, Poland
3. Tinnitus Department, World Hearing Center, Institute of Physiology and Pathology of Hearing, Warsaw/Kajetany, Poland
4. Heart Failure and Cardiac Rehabilitation Department, Medical University of Warsaw, Warsaw, Poland
5. Institute of Sensory Organs, Warsaw, Poland
6. Department of Otorhinolaryngosurgery, World Hearing Center, Institute of Physiology and Pathology of Hearing, Warsaw, Poland