1. Department of Metabolic Diseases, Jagiellonian University Medical College, Krakow, Poland.
2. Department of University Hospital, Krakow, Poland.
3. Department of Paediatrics, Medical University of Lodz, Lodz, Poland.
4. Department of Endocrinology and Diabetology for Children and Adolescents, Medical University of Wroclaw, Wroclaw, Poland.
5. Pediatric Endocrinology Department, Provincial Hospital in Kielce, Kielce, Poland.
6. Department of Pediatrics, Jagiellonian University Medical College, Krakow, Poland.