Corrections to "François Audibert, Alain Gagnon; SOGC Genetics Committee; CCMG Prenatal Diagnosis Committee. Prenatal screening for and diagnosis of aneuploidy in twin pregnancies. Joint SOGC-CCMG Clinical Practice Guideline No. 262, July 2011. J Obstet Gynaecol Can 2011;33(7):754-767.".