Retention in methadone and buprenorphine treatment among African Americans. 

Gryczynski J, Mitchell SG, Jaffe JH, Kelly SM, Myers CP, O’Grady KE, Olsen YK, Schwartz RP (2013). Retention in methadone and buprenorphine treatment among African Americans.  Journal of Substance Abuse Treatment 45(3):287-92.