Predictors of methadone treatment retention from a multi-site study: A survival analysis. 

Kelly SM, O’Grady KE, Mitchell SG, Brown BS, Schwartz RP (2011). Predictors of methadone treatment retention from a multi-site study: A survival analysis. Drug and Alcohol Dependence. 117. (2-3), 170-175. [PMCID: PMC3148301].