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Ebner, T., Oppelt, P., Mayer, R.B. et al. Developmental capacity and pregnancy rate of tetrahedral- versus non-tetrahedral-shaped 4-cell stage human embryos. J Assist Reprod Genet 31, 621 (2014). https://doi.org/10.1007/s10815-014-0226-z
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DOI: https://doi.org/10.1007/s10815-014-0226-z