1. STUDENT SCIENTIFIC CIRCLE AT THE DEPARTMENT OF ENVIRONMENTAL MEDICINE AND EPIDEMIOLOGY IN ZABRZE, SILESIAN MEDICAL UNIVERSITY IN KATOWICE, FACULTY OF MEDICAL SCIENCES IN ZABRZE, SILESIAN MEDICAL UNIVERSITY IN KATOWICE, ZABRZE, POLAND
2. DEPARTMENT OF ENVIRONMENTAL MEDICINE AND EPIDEMIOLOGY IN ZABRZE, FACULTY OF MEDICAL SCIENCES IN ZABRZE, SILESIAN MEDICAL UNIVERSITY IN KATOWICE, ZABRZE, POLAND