Department of Pathology;
The Children's Memorial Health Institute;
Department of Gastroenterology;
Division of Neurogastroenterology and Motility;
Great Ormond Street Hospital;
Department of Pediatrics;
School of Medicine;
Medical University of Silesia;
Celiac disease; Intestinal microbiota; Epithelium; Intraepithelial lymphocytes; Intestinal barrier;