1. Department of Internal Medicine, Diabetology and Nephrology in Zabrze, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland.
2. Student's Scientific Association by the Department of Internal Medicine, Diabetology and Nephrology in Zabrze, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland.
3. Department of Epidemiology, Medical University of Silesia, Katowice, Poland.
4. Second Department of Cardiology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland.
5. Department of Physiology in Zabrze, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland.
6. Department of Gastroenterology and Hepatology in Katowice, Medical University of Silesia, Katowice, Poland.