DOI:
10.1055/s-00028422
Ultrasound International Open
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References
Chang HH, Larson J, Blencowe H, Spong CY, Howson CP, Cairns-Smith S et al.
Preventing preterm births: analysis of trends and potential reductions with interventions in 39 countries with very high human development index.
Lancet 2013;
381: 223-234
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