Panahi M, Honarvar T, Sadegh-Esfahani N, Salari-Moghadam L, Salari-Moghadam S, Jamali R, Aslani F, Sadeghi P. The comparison of the effectiveness of contingency management and trans-theoretical model on the risk of sexual behaviors in cocaine users: A short report study. Chron Dis J. 2020;8(4):197–200.