1. Department of Psychology and Sociology of Health and Public Health, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
2. The Oncology Center of the Region of Warmia and Mazury in Olsztyn, Hospital of the Ministry of the Interior and Administration, Olsztyn, Poland
3. Department of Physiology, Medical University of Gdańsk, Gdańsk, Poland
4. Hospital Dispensary, Regional Specialist Hospital in Olsztyn, Olsztyn, Poland
5. Department of Clinical Laboratory Diagnostics, Medical University of Białystok, Bialystok, Poland