Separating parental and treatment contributions to perinatal health after fresh and frozen embryo transfer in assisted reproduction: A cohort study with within-sibship analysis. by Kjersti Westvik-Johari, Liv Bente Romundstad, Deborah A Lawlor, Christina Bergh, Mika Gissler, Anna-Karina A Henningsen, Siri E Håberg, Ulla-Britt Wennerholm, Aila Tiitinen, Anja Pinborg, Signe Opdahl

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