. Author manuscript; available in PMC: 2021 Feb 1.
Published in final edited form as: Prev Sci. 2020 Feb;21(2):147–157. doi: 10.1007/s11121-019-01076-4
Terms of use and reuse: academic research for non-commercial purposes, see here for full terms. http://www.springer.com/gb/open-access/authors-rights/aam-terms-v1
Figure 1.
X to Y Model.