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Graphic schematization of the study design and demographics of the study population. Age legend: A1 [≤16 years]; A2 [17–40 years]; A3 [>40 years]. Phenotype legend: B1 [non-structuring/non-penetrating]; B2 [structuring]; B3 [penetrating]. Disease localization legend: L1 [ileal]; L2 [colonic]; L3 [ileocolonic].
