Rare and severe adverse events in children with inflammatory bowel disease: analysis of data from the PIBD-SETQuality Safety Registry

R Klomberg, A Hellendoorn, Polychronis Kemos, Dimitris Rizopoulos, Frank M. Ruemmele, Nicholas M. Croft, Lissy de Ridder, Wendy L. van der Woerd, Whitney M. Sunseri, Carsten Posovszky, Darja Urlep, Edward M. Giles, Zrinjka Misak, Dawn R. Ebach, Gemma Pujol- Muncunill, Anne M. Griffiths, Andrew S. Day, Matthew W. Carroll, Maaike W. Schaart, Mary-Anne Morris, Sik-Yong Ong, Peter Szitanyi