International prospective observational study investigating the disease course and heterogeneity of paediatric-onset inflammatory bowel disease: the protocol of the PIBD-SETQuality... by Sibylle Koletzko, Richard K Russell, Arie Levine, Dan Turner, Lissy de Ridder, Frank M Ruemmele, Martine A Aardoom, Janneke N Samsom, Nicholas M Croft, Marina Aloi, Gigi Veereman, Mattias Neyt, Polychronis Kemos, Irma Tindemans, Thomas D Walters

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