Menza et al. BMC Public Health 2010, 10:774 http://www.biomedcentral.com/1471-2458/10/774 reduce sexually transmitted infections among gay men: randomised trial. BMJ 2001, 322(7300):1451-1456. 44. White E, Armstrong B, Saracci R: Principles of Exposure Measurement in Epidemiology: Collecting, Evaluating and Improving Measures of Disease Risk Factors. New York: Oxford University Press;, 2 2008. 45. Stitzer ML, Petry N, Peirce J, Kirby K, Killeen T, Roll J, Hamilton J, Stabile PQ, Sterling R, Brown C, et al: Effectiveness of abstinence-based incentives: interaction with intake stimulant test results. J Consult Clin Psychol 2007, 75(5):805-811. Pre-publication history The pre-publication history for this paper can be accessed here: http://www.biomedcentral.com/1471-2458/10/774/prepub doi:10.1186/1471-2458-10-774 Cite this article as: Menza et al.: Contingency management to reduce methamphetamine use and sexual risk among men who have sex with men: a randomized controlled trial. BMC Public Health 2010 10:774. Page 13 of 13 Submit your next manuscript to BioMed Central and take full advantage of: • Convenient online submission • Thorough peer review • No space constraints or color ﬁgure charges • Immediate publication on acceptance • Inclusion in PubMed, CAS, Scopus and Google Scholar • Research which is freely available for redistribution Submit your manuscript at www.biomedcentral.com/submit