1. Faculty of Mathematics and Computer ScienceUniversity of Warmia & Mazury in Olsztyn Słoneczna 54 10-710 Olsztyn Poland
2. Current affiliation:Faculty of Mathematics, Physics and InformaticsGdansk University Wita Stwosza 57 80-308 Gdansk Poland
3. Department of Basic Biomedical Science School of PharmacyMedical University of Silesia in Katowice Kasztanowa 3 41-200 Sosnowiec Poland
4. Bio-Medical Physics School of Medicine Medical Sciences & NutritionUniversity of Aberdeen Foresterhill Aberdeen AB25 2ZD, Scotland United Kingdom