Progesterone for the prevention of preterm birth in twin pregnancy (STOPPIT) : a randomised, double-blind, placebo-controlled study and meta-analysis

Norman, J E, Mackenzie, F, Owen, P, Mactier, H, Hanretty, K, Cooper, S, Calder, A, Mires, G, Danielian, P, Sturgiss, S, MacLennan, G, Tydeman, G, Thornton, S, Martin, B, Thornton, J G, Neilson, J P & Norrie, J 2009, 'Progesterone for the prevention of preterm birth in twin pregnancy (STOPPIT) : a randomised, double-blind, placebo-controlled study and meta-analysis', The Lancet, vol. 373, no. 9680, pp. 2034-2040. https://doi.org/10.1016/S0140-6736(09)60947-8