TY - JOUR A1 - Wejnert, C. A1 - Pham, H. A1 - Krishna, N. A1 - Le, B. A1 - DiNenno, E. T1 - Estimating design effect and calculating sample size for respondent-driven sampling studies of injection drug users in the United States Y1 - 2012 DO - 10.1007/s10461-012-0147-8 JF - AIDS and Behavior VL - 16 IS - 4 ER -