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*{{pmid17899585}}
*<b>[http://www.kidney.de/mlpefetch.php?search=17899585 Prevention of spontaneous preterm birth: the role of sonographic cervical length in identifying patients who may benefit from progesterone treatment ]</b> Ultrasound Obstet Gynecol 2007; 30(5) ; 675-86 Romero R
*17899585*