1. Clinical Department of Internal Diseases and Geriatrics, Department of Internal Diseases, Dermatology and Allergology, Zabrze, Medical University of Silesia, Katowice, Poland
2. Department of Biochemistry, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
3. Department of Microbiology and Immunology, Medical University of Silesia in Katowice, Zabrze, Poland