Zhang, H., Arhin, S. K., Zhao, J., Hou, X., Chen, Y., & Huang, Z. (2019). Delayed development influences the outcome of different grades of D5 and D6 blastocysts during freeze–thaw cycle. Cellular and Molecular Biology, 65(4), 1–5. https://doi.org/10.14715/cmb/2019.65.4.1