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Effect of progesterone on cervical shortening in women at r..:

O'Brien, J. M. ; DeFranco, E. A. ; Adair, C. D....
Ultrasound in Obstetrics & Gynecology.  34 (2009)  6 - p. 653-659 , 2009
Link: https://doi.org/10.1002/uog.7338