Progesterone and the Risk of Preterm Birth among Women with a Short Cervix.
Fonseca, Eduardo B.; Celik, Ebru; Parra, Mauro; Singh, Mandeep; Nicolaides, Kypros H.; New England Journal of Medicine, 2007, vol. 357, issue 5, p 462, ISSN 00284793. ISBN 00284793.

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