DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
van Calster B, Abdallah Y, Guha S et al.
Rationalizing the management of pregnancies of unknown location: temporal and external validation of a risk prediction model on 1962 pregnancies.
Hum Reprod 2013;
28: 609-616
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