@article{Wang2005,
author = {Wang, J. and Carlson, R.G. and Falck, R.S. and Siegal, H.A. and Rahman, A.  and Li, L.},
title= {Respondent-driven sampling to recruit MDMA users: A methodological assessment.},
year = {2005},
doi = {10.1016/j.drugalcdep.2004.10.011},
journal = {Drug and Alcohol Dependence},
volume = {78},
number = {2},
pages = {147--157},
}