1)厚生労働省 : 平成27(2015)年人口動態統計(確定数)の概況
2)厚生労働省 : 平成17(2005)年人口動態統計(確定数)の概況
3)厚生労働省 : 平成28(2016)年人口動態統計(確定数)の概況
4)Practice Bulletin No. 169 : Multifetal gestations : twin, triplet, and higher-order multifetal pregnancies. Obstet Gynecol 128 : e131─146, 2016
5)ACOG Practice Bulletin No.142 : Cerclage for the management of cervical insufficiency. Obstet Gynecol 123 : 372─379, 2014
6)Drakeley AJ, et al : Cervical cerclage for prevention of preterm delivery : meta-analysis of randomized trials. Obstet Gynecol 102 : 621─627, 2003
7)National Collaborating Centre for Women's and Children's Health : National Institute for Health and Clinical Excellence : Guidance, multiple pregnancy : the management of twin and triplet pregnancies in the antenatal period. RCOG Press, National Collaborating Centre for Women's and Children's Health, London, 2011
8)Sentilhes L, et al : Prevention of spontaneous preterm birth : guidelines for clinical practice from the French College of Gynaecologists and Obstetricians(CNGOF). Eur J Obstet Gynecol Reprod Biol 210 : 217─224, 2017
9)Brown R, et al : Cervical insufficiency and cervical cerclage. J Obstet Gynaecol Can 35 : 1115─1127, 2013
10)Kawaguchi H, et al : Perinatal death of triplet pregnancies by chorionicity. Am J Obstet Gynecol 209 : 36.e31─e37, 2013
11)Rebarber A, et al : Prophylactic cerclage in the management of triplet pregnancies. Am J Obstet Gynecol 193 : 1193─1196, 2005
12)Bernasko J, et al : Is routine prophylactic cervical cerclage associated with significant prolongation of triplet gestation? J Matern Fetal Neonatal Med 19 : 575─578, 2006
13)Strauss A, et al : Routine cervical cerclage in higher order multiple gestation--does it prolong the pregnancy? Twin Res 5 : 67─70, 2002
14)Elimian A, et al : Perinatal outcome of triplet gestation : does prophylactic cerclage make a difference? J Matern Fetal Med 8 : 119─122, 1999
15)Francois K, et al : Outcomes of quintuplet pregnancies. J Reprod Med 46 : 1047─1051, 2001