Cryopreservation / Pregnancy / Humans / Fertility and Sterility / Female / Embryo Transfer / Clinical Sciences / Adult / Public health systems and services research / Fertilization in Vitro / Female Infertility / Endometrium / Pregnancy Rate / Embryo Transfer / Clinical Sciences / Adult / Public health systems and services research / Fertilization in Vitro / Female Infertility / Endometrium / Pregnancy Rate