1. Pediatric Gastroenterology Unit Department of Pediatrics University of Lausanne Centre Hospitalier Universitaire Vaudois Lausanne Switzerland
2. Hemato‐Oncology Unit Department of Pediatrics University of Lausanne Switzerland
3. Department of Pediatrics Centre Hospitalier du Valais Romand Sion Switzerland
4. Department of Pediatrics Centre Hospitalier des Pays de Morlaix France