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R. bras. Est. Pop., Rio de Janeiro, v. 29, n. 2, p. 493-496, jul./dez. 2012 * Ph.D in Demography, associate professor of the Federal University of Minas Gerais. ** Sc.D in Epidemiology, associate professor of the Federal University of Minas Gerais. 1 Available in: . Access in: 24 Jun. 2012. 2 Available in: . Access in: 24 Jun. 2012. 3 Available in: . Access in: 24 Jun. 2012. On the issue of homophily in respondent-driven sampling: notes based on the case of men who have sex with men in Belo Horizonte, Brazil