Fig. 3From: Current diagnosis and management of Crohn’s disease in China: results from a multicenter prospective disease registryDisease behavior (a) and disease location (b) classification of patients with Crohn’s disease. B1: non-stricturing non-penetrating; B2: stricturing; B3: penetrating; L1: terminal ileum; L2: colon; L3: ileocolon; L4: upper gastrointestinal tractBack to article page