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The levels of serum immunoglobulins in CD patients with different disease phenotypes. The levels of serum IgG (A), serum IgA (B), serum IgM (C), and serum IgG4 (D) in CD patients with complicated disease. The levels of serum IgG (E), IgA (F), IgM (G) and IgG4 (H) in CD patients with isolated ileal disease. Bar graphs are presented as mean ± SD. *P < 0.05, **P < 0.01, ***P < 0.001.
