HLA-B and Behcet disease: HLA-B*51+ BD patients have:Increased risk of ocular lesion (OR 1.59, 95% CI: 1.37–1.84; p < 0.001)Decreased risk of genital ulceration (OR 0.72, 95% CI: 0.62–0.84; p < 0.001) and gastrointestinal symptoms (OR 0.65, 95% CI: 0.55–0.77; p < 0.001)