SSB and sexually transmitted disease: CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; LDH: lactate dehydrogenase; RBC: red blood cells; ANA: antinuclear antibody; SSA: Sjögren's-syndrome-related antigen A; SSB: Sjögren's-syndrome-related antigen B; HCV: hepatitis C; HbsAg: hepatitis B surface antigen; VDRL: Venereal Disease Research Laboratory