DOI:
10.1055/s-00000142
Frauenheilkunde up2date
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References
Maruotti GM, Saccone G, Morlando M. et al.
First-trimester ultrasound determination of chorionicity in twin gestations using the lambda sign: a systematic review and meta-analysis.
Eur J Obstet Gynecol Reprod Biol 2016;
202: 66-70
doi:10.1016/j.ejogrb.2016.04.023
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