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. 2019 Jul 3;10:427. doi: 10.3389/fendo.2019.00427

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Copyright © 2019 Papanikolaou, Chartomatsidou, Timotheou, Tatsi, Katsoula, Vlachou, Asouchidou, Zafeiratis and Najdecki.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Cumulative Pregnancy Rate (CPR)^*, Cumulative Clinical Pregnancy Rate (CCPR) and Cumulative Live Birth Rate (CLBR) of each study group; Group A (1–2 blastocysts frozen), Group B (3–4 blastocysts frozen), Group C (5–6 blastocysts frozen), and Group D (≥7 blastocysts frozen). ^*Defined as positive hCG test.