1. Department of Pediatric, Gastroenterology, and Metabolic Diseases, Poznań University of Medical Sciences, Poznań, Poland
2. Department of Pediatric Gastroenterology and Metabolic Diseases, Poznań University of Medical Sciences, Poznań, Poland
3. Department of Pediatrics, Nutrition and Metabolic Diseases, The Children's Memorial Health Institute, Warsaw, Poland
4. Department of Medical Genetics, The Children's Memorial Health Institute, Warsaw, Poland