Correction to: Subst Abuse Treat Prev Policy (2018) 13:36

https://doi.org/10.1186/s13011-018-0173-2

Following publication of the original article [1], we have been notified that there are some parts in the article text that need to be changed as per below:

  • Table 2 Ratings of methodological quality by EPHPP should change Blinding rating of Busch et al. (2017) [43] from Weak to Moderate and Global rating from Moderate to Strong;

  • Abstract text part should be changed to: One trial received weak methodological quality, five moderate, and two strong;

  • Results text part in Methodological quality assessment should be changed to: Overall, two studies received a methodological quality rating of strong [43, 49], five studies of moderate [45–48, 50], and one study of weak [44];

  • Discussion text part should be changed to: Regarding the quality of the studies, it is of note that only two of the studies reached the qualification of strong methodological quality [43, 49].