Piotr Stogowski1, Karolina Anuszkiewicz2. 1. Faculty of Medicine, Medical University of Gdansk, Marii Skłodowskiej- Curie 3a, 80-210, Gdansk, Poland. stogowski@gumed.edu.pl. 2. Faculty of Medicine, Medical University of Gdansk, Marii Skłodowskiej- Curie 3a, 80-210, Gdansk, Poland.