Coomarasamy, A, Devall, A J, Cheed, V, Harb, H, Middleton, L J, Gallos, I D, Williams, H, Eapen, A K, Roberts, T, Ogwulu, C C, Goranitis, I, Daniels, J P, Ahmed, A, Bender-Atik, R, Bhatia, K, Bottomley, C, Brewin, J, Choudhary, M, Crosfill, F, Deb, S, Duncan, W C, Ewer, A, Hinshaw, K, Holland, T, Izzat, F, Johns, J, Kriedt, K, Lumsden, M-A, Manda, P, Norman, J E, Nunes, N, Overton, C E, Quenby, S, Rao, S, Ross, J, Shahid, A, Underwood, M, Vaithilingam, N, Watkins, L, Wykes, C, Horne, A & Jurkovic, D 2019, ' A Randomized Trial of Progesterone in Women with Bleeding in Early Pregnancy ', New England Journal of Medicine, vol. 380, no. 19, pp. 1815-1824 . https://doi.org/10.1056/NEJMoa1813730