Figure 1From: A national cross-sectional study among drug-users in France: epidemiology of HCV and highlight on practical and statistical aspects of the design Observed links (arrows) and declared links (dotted arrows) between the population of services and the population of drug users, ANRS-Coquelicot study, France 2004–2005. The shaded boxes represent the sampled services and the sampled individuals.Back to article page