To explore how expectant mothers at risk for preterm birth would like to be involved in decision-making at the margin of viability and what they would base their decisions on.

中文翻译：

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有早产风险的孕妇对生存边缘决策的态度和价值观

探讨有早产风险的准妈妈在生存边缘如何参与决策以及她们的决策依据是什么。