. 2021 Dec 17;17(4):e1206. doi: 10.1002/cl2.1206
© 2021 The Authors. Campbell Systematic Reviews published by John Wiley & Sons Ltd on behalf of The Campbell Collaboration
This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Figure 1.

Theory of change. Source: 3ie, authors