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. 2016 Jun 22;6:28036. doi: 10.1038/srep28036

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Blood samples were obtained by venipuncture at seven time points during COH: Time point 1 (GnRH-a day): initiate Gonadotropin-releasing hormone agonist (GnRH-a) administration day; Time point 2 (Gn day): initiate Gonadotropin (Gn) administration day; Time point 3 (hCG day): human chorionic gonadotropin (hCG) administration day (the serum was collected before hCG injection); Time point 4: 12 h after hCG administration; Time point 5 (OPU day): oocyte picked-up (OPU) day (about 36 h after hCG administration); Time point 6: 48 h after OPU and Time point 7: 14 days after embryo transfer (ET).