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Amann, Manuel; Haug, Severin; Wenger, Andreas; Baumgartner, Christian; Ebert, David D; Berger, Thomas; Stark, Lars; Walter, Marc; Schaub, Michael P (2018). The Effects of Social Presence on Adherence-Focused Guidance in Problematic Cannabis Users: Protocol for the CANreduce 2.0 Randomized Controlled Trial. JMIR research protocols, 7(1), e30. JMIR Publications 10.2196/resprot.9484