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Table 1 Information provided to participants before they provide signed informed consent

From: CANreduce-SP—adding psychological support to web-based adherence-focused guided self-help for cannabis users: study protocol for a three-arm randomized control trial

1. Purpose, background, and an overview of the study
2. Inclusion and exclusion criteria (Table 2)
3. Description of the three treatment armsa and their chances of being allocated to each one of these three arms
4. Financial aspects (no participation fee, compensation for participation)
5. Potential risks of participation and when to contact their general practitioner or a professional they can select from a medical advisory and emergency service list that will always be accessible to them, merely by clicking on the site’s Help icon
6. The inability of CANreduce-SP to replace face-to-face therapy for problematic cannabis use or abuse
7. Voluntary nature of their participation and their right to withdraw at any time without consequences, except for the loss of further compensation
8. Confidentiality and data protection (anonymity is ensured by not recording real names or postal addresses and by deleting e-mail addresses and phone numbers before statistical analysis and data archiving)
9. Protocol approval was granted by the ethics committee of the IMIM Hospital del Mar d'Investigacions Mèdiques after the committee had reviewed the study: num. 2019/8901/I.
  1. aNo details about how the two active treatment arms differ will be provided