Estimating the number of persons who inject drugs in the United States by meta-analysis to calculate national rates of HIV and Hepatitis C virus infections - Lansky, Amy L.; Crepaz, Nicole; Mizuno, Yūko; Chen, Robert; Gust, Deborah; Mitsch, Andrew; Wejnert, Cyprian; Holtzman, Deborah; Johnson, Christopher; Finlayson, Teresa (PLOS ONE, 2014)