Chivers, S.C., Vasavan, T., Nandi, M., Hayes-Gill, B.R., Jayawardane, I.A., Simpson, J.M., Williamson, C., Fifer, W.P., Lucchini, M., "Measurement of the cardiac time intervals of the fetal ECG utilising a computerised algorithm: A retrospective observational study", JRSM Cardiovascular Disease, 2022