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Liu, Jue and Zhang, Shikun and Liu, Min and Wang, Qiaomei and Shen, Haiping and Zhang, Yiping (2017) Maternal pre-pregnancy infection with hepatitis B virus and the risk of preterm birth: a population-based cohort study. The Lancet Global Health, 5 (6). e624-e632. ISSN 0140-6736