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. 2022 Aug 3;12(8):e058212. doi: 10.1136/bmjopen-2021-058212

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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IG1, intervention group 1 (‘standard’ version of step 2 of the stepped care model); IG2, intervention group 2 (‘flex’ version of step 2 of the stepped care model); IG3, intervention group 3 (‘basic’ version of step 2 of the stepped care model); ITT, intention-to-treat; M, months; TAU, treatment-as-usual; W, weeks.