Eftekhari, A, Westra, J, Stegehuis, V, Holm, N R, Van De Hoef, T P, Kirkeeide, R L, Piek, J J, Lance Gould, K, Johnson, N P & Christiansen, E H 2022, ' Prognostic value of microvascular resistance and its association to fractional flow reserve : a DEFINE-FLOW substudy ', Open Heart, vol. 9, no. 1, 001981 . https://doi.org/10.1136/openhrt-2022-001981 Eftekhari, A, Westra, J, Stegehuis, V, Holm, N R, van de Hoef, T P, Kirkeeide, R L, Piek, J J, Lance Gould, K, Johnson, N P & Christiansen, E H 2022, ' Prognostic value of microvascular resistance and its association to fractional flow reserve : a DEFINE-FLOW substudy ', Open Heart, vol. 9, no. 1, e001981 . https://doi.org/10.1136/openhrt-2022-001981 Open heart, 9(1):001981. BMJ Publishing Group