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Previous Volume 357:2306-2307 November 29, 2007 Number 22 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

	Full Text PDF PDA Full Text Purchase this article Add to Personal Archive Add to Citation Manager Notify a Friend E-mail When Cited E-mail When Letters Appear Related Article by Rouse, D. J. Related Article by Fonseca, E. B. PubMed Citation

To the Editor: The reports by Fonseca et al. and Rouse et al. (Aug. 2 issue)^1,2 raise important issues regarding the efficacy and safety of progestins for the prevention of preterm birth. An essential difference between the two study designs is that the study by Fonseca et al. evaluated progesterone administration for a defined pathologic condition, premature cervical shortening, and the the study by Rouse et al. assessed treatment for a risk factor, twin pregnancy.

Rouse et al. observed an increase in deliveries that occurred before 28 weeks of gestation and a nonsignificant increase in newborns with birth weights below . . . [Full Text of this Article]

This article has been cited by other articles:

• Mitchell, B. F., Taggart, M. J. (2009). Are animal models relevant to key aspects of human parturition?. Am. J. Physiol. Regul. Integr. Comp. Physiol. 297: R525-R545 [Abstract] [Full Text]