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Guo, Y., Sun, X., Wang, M. et al. Effect of morphological grading on pregnancy outcome of single frozen embryo transfer. J Assist Reprod Genet 36, 2399–2400 (2019). https://doi.org/10.1007/s10815-019-01577-9
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DOI: https://doi.org/10.1007/s10815-019-01577-9