Vaginal progesterone prophylaxis for preterm birth (the OPPTIMUM study) : a multicentre, randomised, double-blind trial

Norman, J E, Marlow, N, Messow, C-M, Shennan, A, Bennett, P R, Thornton, S, Robson, S C, McConnachie, A, Petrou, S, Sebire, N J, Lavender, T, Whyte, S, Norrie, J & OPPTIMUM study group 2016, 'Vaginal progesterone prophylaxis for preterm birth (the OPPTIMUM study) : a multicentre, randomised, double-blind trial', The Lancet, vol. 387, no. 10033, pp. 2106-2116. https://doi.org/10.1016/S0140-6736(16)00350-0