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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Ann Epidemiol. 2012 Mar 14;22(5):354–363. doi: 10.1016/j.annepidem.2012.02.012

Figure 1.

Figure 1

NHBS-IDU2 recruitment chains. Participants reporting male-to-male sex in the previous 12 months are in filled circles, those not so reporting are in open circles; seeds (with number) are enlarged circles