See Marcus R. Munafò & George Davey Smith, ‘Robust Research Needs Many Lines of Evidence’, Nature 553, no. 7689 (25 Jan. 2018): pp. 399–401; https://doi.org/10.1038/d41586-018-01023-3; and Debbie A. Lawlor et al., ‘Triangulation in Aetiological Epidemiology’, International Journal of Epidemiology 45, no. 6 (20 Jan. 2017): pp. 1866–86; https://doi.org/10.1093/ije/dyw314.