Erratum to: Evaluating the efficacy of a web-based self-help intervention with and without chat counseling in reducing the cocaine use of problematic cocaine users: the study protocol of a pragmatic three-arm randomized controlled trial
Crossref DOI link:
Update policy: https://doi.org/10.1007/SPRINGER_CROSSMARK_POLICY
Schaub, Michael P.
Maier, Larissa J.
Quednow, Boris B.