Twisk, J. W. R. (Contributor), Lamp, S. J. (Contributor), Heymans, M. W. (Contributor), Valente, M. J. (Contributor), MacKinnon, D. P. (Contributor), Rijnhart, J. J. M. (Contributor) (1 Jan 2021). Additional file 4 of Mediation analysis methods used in observational research: a scoping review and recommendations. figshare Academic Research System. 10.6084/m9.figshare.16864831.v1