1. Chair and Department of Medical and Molecular Biology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
2. John Paul II Hospital of Oncology, General Surgery Ward, Bielsko Biała, Poland
3. Department of Basic Medical Sciences, School of Public Health in Bytom, Medical University of Silesia, Katowice, Poland
4. Chair and Department of Environmental Medicine and Epidemiology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
5. Specialist Hospital of Lung Diseases and Tuberculosis, Thoracic Surgery Ward, Bystra Śląska, Poland