Research ArticleOriginal Article
Open Access

Prevalence of preterm birth and risk factors associated with it at different gestational ages

A multicenter retrospective survey in China

Yi-Jie Zhang, Yan Zhu, Li Zhu, Cheng-Qiu Lu, Chao Chen and Lin Yuan
Saudi Medical Journal June 2022, 43 (6) 599-609; DOI: https://doi.org/10.15537/smj.2022.43.6.20220210

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