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Trial protocol OPPTIMUM– Does progesterone prophylaxis for the prevention of preterm labour improve outcome?

Jane E Norman*, Andrew Shennan, Phillip Bennett, Steven Thornton, Stephen Robson, Neil Marlow, John Norrie, Stavros Petrou, Neil Sebire, Tina Lavender and Sonia Whyte

BMC Pregnancy and Childbirth 2012, 12:79  doi:10.1186/1471-2393-12-79