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Purpose: The aim of the present study was to identify subsets of women undergoing two-embryo transfer in in vitro fertilization (IVF) who are prone to give birth to twins. Methods: During 1990 to 2002 4580 day 2 or day 3 two-embryo transfers were conducted and these constituted the study population. Results: By selecting combinations of factors, some subsets of patients where single-embryo...
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