1. Department of Internal Diseases and Allergology, Institute of Medical Sciences, University of Opole, Opole, Poland.
2. Department of Internal Diseases, Allergology and Clinical Immunology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland.
3. Department of Internal Diseases, Diabetology and Nephrology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland.
4. Department of Internal Diseases and Nephrodiabetology, Medical University of Lodz, Lodz, Poland.