1. Department of General Pediatrics and Neonatology, University Children’s Hospital, University Giessen, 35392 Giessen, Germany
2. German Crohn’s Disease and Ulcerative Colitis Association, DCCV, National Association for Chronic Inflammatory Diseases of the Digestive Tract, 10179 Berlin, Germany
3. Department of Pediatrics, Greifswald University Medical Center, 17475 Greifswald, Germany