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To assess perinatal risks to singleton births after in vitro fertilization (IVF) versus spontaneous conception.Cross-sectional.A 2006 registry database of the Japan Society of Obstetrics and Gynaecology (JSOG) capturing 5.8% of total births.53,939 singleton births from spontaneous conceptions and 1,408 singletons after IVF.None.Perinatal death, low-birth weight (LBW), small for gestational age (SGA),...
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