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APA Citation
Norman, J. E., Marlow, N., Messow, C., Shennan, A., Bennett, P. R., Thornton, S., Robson, S. C., McConnachie, A., Petrou, S., Sebire, N. J., Lavender, T., Whyte, S., Norrie, J., & , (2016). vaginal progesterone prophylaxis for preterm birth (the OPPTIMUM study): a multicentre, randomised, double-blind trial. Lancet, 387(10033), 2106–2116. http://access.bl.uk/ark:/81055/vdc_100032398876.0x000061