1. Scientific Society of Medical Students, Faculty of Medical Sciences in Katowice Medical University of Silesia Katowice Poland
2. Department of Pediatrics, Faculty of Medical Sciences in Zabrze Medical University of Silesia Katowice Poland
3. Department of Pediatrics, Pediatric Obesity and Metabolic Bone Diseases, Chair of Pediatrics and Pediatric Endocrinology, Faculty of Medical Sciences in Katowice Medical University of Silesia Katowice Poland