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Liu S, Joseph KS, Kramer MS, Allen AC, Sauve R, Rusen ID, Wen SW; Fetal and Infant Health Study Group of the Canadian Perinatal Surveillance System.Liu S, et al.JAMA. 2002 Mar 27;287(12):1561-7. doi: 10.1001/jama.287.12.1561.JAMA. 2002.PMID: 11911759
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Liu S, Rusen ID, Joseph KS, Liston R, Kramer MS, Wen SW, Kinch R; Maternal Health Study Group of the Canadian Perinatal Surveillance System.Liu S, et al.J Obstet Gynaecol Can. 2004 Aug;26(8):735-42. doi: 10.1016/s1701-2163(16)30645-4.J Obstet Gynaecol Can. 2004.PMID: 15307978
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Liu S, Heaman M, Joseph KS, Liston RM, Huang L, Sauve R, Kramer MS; Maternal Health Study Group of the Canadian Perinatal Surveillance System.Liu S, et al.Obstet Gynecol. 2005 Apr;105(4):836-42. doi: 10.1097/01.AOG.0000154153.31193.2c.Obstet Gynecol. 2005.PMID: 15802414
Liu S, Joseph KS, Hutcheon JA, Bartholomew S, León JA, Walker M, Kramer MS, Liston RM; Maternal Health Study Group of Canadian Perinatal Surveillance System.Liu S, et al.Am J Obstet Gynecol. 2013 Sep;209(3):209.e1-8. doi: 10.1016/j.ajog.2013.05.033. Epub 2013 May 20.Am J Obstet Gynecol. 2013.PMID: 23702296