Clustering of (auto)immune diseases with early-onset and complicated inflammatory bowel disease. - De Mesquita, Mirjam Bueno; Ferrante, Marc; Henckaerts, Liesbet; Joossens, Marie; Janssens, Virginie; Hlavaty, Tibor; Pierik, Marie; Joossens, Sofie; Van Schuerbeek, Nele; Van Assche, Gert; Rutgeerts, Paul; Vermeire, Severine; et al. (European Journal of Pediatrics, 2009)