Fig. 2From: Strategies to control HIV and HCV in methadone maintenance treatment in Guangdong Province, China: a system dynamic modeling studyFitness of the simulated numbers compared to the historical HIV (a) and HCV (b) prevalence among MMT participants. (Note: number of MMT participants were 605, 2055, 2864, 2942, 2710, 3301, 3368, 2840 in 2006-2013)Back to article page