1. DISTRICT HOSPITAL OF ORTHOPAEDICS AND TRAUMA SURGERY IN PIEKARY ŚLĄSKIE, PIEKARY ŚLĄSKIE, POLAND
2. FACULTY OF HEALTH SCIENCES, JAN DŁUGOSZ UNIVERSITY IN CZĘSTOCHOWA, CZĘSTOCHOWA, POLAND
3. NON-PUBLIC HEALTH CARE INSTITUTION MEDICT, GLIWICE, POLAND
4. DEPARTMENT OF BIOCHEMISTRY, FACULTY OF MEDICAL SCIENCES IN ZABRZE, MEDICAL UNIVERSITY OF SILESIA IN KATOWICE, ZABRZE, POLAND
5. DEPARTMENT OF INTERNAL MEDICINE, ANGIOLOGY AND PHYSICAL MEDICINE, FACULTY OF MEDICAL SCIENCES IN ZABRZE, MEDICAL UNIVERSITY OF SILESIA IN KATOWICE, BYTOM, POLAND