Nimmo, A, Latimer, N, Oniscu, G C, Ravanan, R, Taylor, D M & Fotheringham, J 2022, ' Propensity score and instrumental variable techniques in observational transplantation studies : An overview and worked example relating to pre-transplant cardiac screening ', Transplant international, vol. 35, 10105 . https://doi.org/10.3389/ti.2022.10105