Pediatrics Clinics II Emergency Hospital for Children, Cluj-Napoca, Romania. Department of Clinical Gastroenterology IV, Regional Institute for Gastroenterology and Hepatology Prof. Dr. "O. Fodor", Cluj-Napoca, Romania. Department of Morphology, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania. Department of Immunology, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania. Department of Pediatrics II, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania.