7Ruano R, Brizot Mde L, Liao AW, et al. selective fetoscopic laser pho- tocoagulation of superficial placental anastomoses for the treatment of severe twin- twin transfusion syndrome [ J ] Clinic (Sao Paulo),2009, 64(2):91 -96.
8Froen J F, Arnestad M, Frey K, et al. Risk factors for sudden intran - terine unexplained death : epidemiologic charaeteristics of singleton cases in Oslo Nar way[J]. Am J Obstet Gynecol,2001,184(4) : 694.
9Vinnars MT, Nasiell J, Ghazi S, et al. The severity of clinical manifestations in preeclampsia correlates with the amount of placental infarction[J]. Acta Obstet Gynecol Stand, 2011,90 (1) :19-25.
10Nahar L, Nahar K, Hossain MI, et al. Placental changes in pregnancy induced hypertension[J]. J Mymensingh Med, 2013, 22(4) : 684-693.
