@article{Johnston2013,
author = {Johnston, L.G. and Chen, Y.H. and Silva-Santisteban, A. and Raymond, H.F.},
title= {An empirical examination of respondent driven sampling design effects among HIV risk groups from studies conducted around the world},
year = {2013},
doi = {10.1007/s10461-012-0394-8},
volume = {17},
number = {6},
pages = {2202--2210},
}