1. Department of Pediatrics, Hospital of Lithuanian University of Health Sciences Kauno klinikos, Kaunas, Lithuania;
2. Lithuanian University of Health Science, Medical Academy, Kaunas, Lithuania;
3. Department of Pediatrics, Hospital Universitario, Madrid, Spain;
4. Department of Pediatric Surgery, Hospital of Lithuanian University of Health Sciences Kauno klinikos, Kaunas, Lithuania;
5. Department of Laboratory Medicine, Hospital of Lithuanian University of Health Sciences Kauno klinikos, Kaunas, Lithuania