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Adler-Levy, Y., Lunenfeld, E. and Levy, A. (2007) Obstetric outcome of twin pregnancies conceived by in vitro fertilization and ovulation induction compared with those conceived spontaneously. European Journal of Obstetrics & Gynecology and Reproductive Biology, 133, 173-178. doi:10.1016/j.ejogrb.2006.08.010

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