2Berkowitz GS, Papiernik E. Epidemiology of preterm birth [J].Epidemiol Rev, 1993, 15: 414-443
3Dirnberger DR, Yoder BA, Dordon MC. Single versus repeated sourse antenatal corticosteroids:outcome in singleton and multiple - gestation pregnancies[J]. Am J Perinatol, 2001, 18: 267
4Vermillion ST, Soper DE, Chasedunn - Roark J. Neonatal Sepsis after betamethasone administration to patiens with preterm premature rupture of membraner[J]. Am J Obstet Gynecol, 1999,181:320-327
5Vermillion ST, Soper DE, Newman RB. Neonatal sepsis and death after multiple courses of antenatal beatamethasone therapy[J ]. Am J Obstet Gynecol, 2000,183: 810-814
6Abbasis, Hirsch D, Davis J, et al. Effect of single versus multiple course of antenatal corticosteroids on maternal and neonatal outcome[J]. Am J Obstet Gynecol, 2000, 182:1243-1249
7Hela, Gordon Mc, Lightner CR. Adrenal suppression induced by betamethasone in Nomen at risk for premature delivery[J]. Obstet Gynecol, 2000, 96: 287-290
8Fisher JE, Smith RS, Lagrandeur R, et al. Gestational diabetes mellitus in women receiving beta - adrenergics and corticosteroids for threatened preterm delivery[J]. Obstet Gynecol, 1997,90: 880-883
