CXCL12 and intestinal cancer: Cochrane’s Q test did not provide evidence of heterogeneity between CCL14 (p = 0.768, p = 0.808), CCL22 (p = 0.502), CCL28 (p = 0.175), CXCL12 (p = 0.530) and CXCL14 (p = 0.534) and intestinal cancer.