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. 2021 May 27;11(5):e049872. doi: 10.1136/bmjopen-2021-049872

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© Author(s) (or their employer(s)) 2021. 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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Framework model for process (dark grey) and impact evaluation (light grey), adapted from Grant et al ¹⁶. cRCT, cluster randomised controlled trial; GP, general practitioner; HP, hospital physician.