1. Department of Family Medicine, Wroclaw Medical University, Syrokomli Wroclaw, Poland and Department of Clinical Medicine, Family Medicine Research Centre, Örebro University, Örebro, Sweden.
2. Department of Family Medicine, Wroclaw Medical University, Syrokomli Wroclaw, Poland
3. Department of Pathological Anatomy, Wroclaw Medical University, Wroclaw, Poland.