1Martin JA, Hamilton BE, Sutton PD, et al. Births: final data for 2004. Natl Vital Stat Rep, 2006,55:1-101.
2Bajoria R, Kingdom J. The case for routine determination of chorionicity and zygosity in multiple pregnancy. Prenat Diagn, 1997,17 : 1207-1225.
3Dube J, Dodds L, Armson BA. Does chorionicity or zygosity predict adverse perinatal outcomes in twins? Am J Obstet Gynecol, 2002,186:579-583.
4Carroll SG, Tyfield L, Reeve L, et al. Is zygosity or chorionicity the main determinant of fetal outcome in twin pregnancies? Am J Obstet Gynecol, 2005,193:757-761.
5Acosta-Rojas R, Becker J, Munoz-Abellana B, et al. Twin chofionicity and the risk of adverse pefinatal outcome. Int J Gynaecol Obstet, 2007,96:98-102.
6Denbow ML, Cox P, Taylor M, et al. Placental angioarchitecture in monochofionic twin pregnancies: relationship to fetal growth, fetofetal transfusion syndrome, and pregnancy outcome. Am J Obstet Gynecol, 2000,182:417-426.
7Fusi L, McParland P, Fisk N, et al. Acute twin-twin transfusion: a possible mechanism for brain-damaged survivors after intrauterine death of a monochorionic twin. Obstet Gynecol, 1991,78:517- 520.
8Nicolini U, Poblete A. Single intrauterine death in monochorionic twin pregnancies. Ultrasound Obstet Gynecol, 1999,14:297-301.
9Bajoria R, Wee LY, Anwar S, et al. Outcome of twin pregnancies complicated by single intrauterine death in relation to vascular anatomy of the monochorionic placenta. Hum Reprod, 1999,14 : 2124-2130.
10Mari G, Deter RL, Carpenter RL, et al. Noninvasive diagnosis by Doppler ultrasonography of fetal anemia due to maternal red-cell alloimmunization. Collaborative Group for Doppler Assessment of the Blood Velocity in Anemic Fetuses. N Engl J Med, 2000,342: 9-14.