1. Specialist Dental Center A.H. Frelich Żory, Katowice, Poland.
2. Department of Otorhinolaryngology and Laryngological Oncology in Zabrze, Medical University of Silesia, Katowice, Poland.
3. Department of Pneumonology, Medical University of Silesia/The Kornel Gibiński University Center, Department of Pneumonology, Katowice, Poland.