Two-stage nomogram models in mid-gestation for predicting the risk of spontaneous preterm birth in twin pregnancy
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MATERNAL-FETAL MEDICINE
Two‑stage nomogram models in mid‑gestation for predicting the risk of spontaneous preterm birth in twin pregnancy Jun Zhang1 · Mian Pan1 · Wenqiang Zhan3 · Lianghui Zheng1 · Xiaoxiang Jiang1 · Xiaoying Xue2 Received: 9 March 2020 / Accepted: 3 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose This study aimed to develop two-stage nomogram models to predict individual risk of preterm birth at
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