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Obstet Gynecol. 1997 Apr;89(4):594-9. doi: 10.1016/s0029-7844(97)00045-8.
Time to pregnancy and preterm delivery.
Henriksen TB, Baird DD, Olsen J, Hedegaard M, Secher NJ, Wilcox AJ
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Obstet Gynecol. 1997 Apr;89(4):594-9. doi: 10.1016/s0029-7844(97)00045-8.
Henriksen TB, Baird DD, Olsen J, Hedegaard M, Secher NJ, Wilcox AJ