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"Older persons' exclusion from sexually transmitted disease risk-reduction clinical trials." Sexually transmitted diseases 34, no. 8 (2007): 541-4. Abstract
"Quality of HIV care provided by nurse practitioners, physician assistants, and physicians." Annals of internal medicine 143, no. 10 (2005): 729-36. Abstract
"Simultaneous recruitment of drug users and men who have sex with men in the United States and Russia using respondent-driven sampling: sampling methods and implications." Journal of urban health : bulletin of the New York Academy of Medicine 86 Suppl 1 (2009): 5-31. Abstract
"Subpopulations of illicit drug users reached by targeted street outreach and respondent-driven sampling strategies: implications for research and public health practice." Annals of epidemiology 21, no. 4 (2011): 280-9. Abstract
