TY - JOUR A1 - Salganik, M.J. A1 - Fazito, D. A1 - Bertoni, N. A1 - Abdo, A.H. A1 - Mello, M.B. A1 - Bastos, F.I. T1 - Assessing network scale-up estimates for groups most at risk of HIV/AIDS: Evidence from a multiple-method study of heavy drug users in Curitiba, Brazil Y1 - 2011 DO - 10.1093/aje/kwr246 VL - 174 IS - 10 ER -