Figure 1From: Risk factors associated with prevalent and incident syphilis among an HIV-infected cohort in Northeast China Procedure of enrollment and follow-up. A total of 1302 participants were invited, 243 did not meet enrollment criteria, 49 declined enrollment. A total of 1010 participants were included at baseline. Of the 810 participants who were syphilis seronegative at baseline, 634 completed at least one follow-up visit.Back to article page