Risk factors associated with preterm (<37+0 weeks) and early preterm birth (<32+0 weeks): univariate and multivariate analysis of 106 345 singleton births from the 1994 statewide perinatal survey of Bavaria.

Eur J Obstet Gynecol Reprod Biol. 1998 Oct;80(2):183-9. doi: 10.1016/s0301-2115(98)00130-4.

Martius JA, Steck T, Oehler MK, Wulf KH

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