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is ?:annotates of
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  • [\'Department of Obstetrics, Chengdu Jinjiang Maternity and Child Health Hospital, Chengdu, China.\', \'The First Clinical College of Chongqing Medical University, Chongqing, China.\', \'North Sichuan Medical College, Nanchong, China.\']
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  • -1
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?:doi
  • 10.1080/14767058.2020.1759541
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?:journal
  • The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians
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  • 32354293
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  • -1.0
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  • -1
?:title
  • Coronavirus disease 2019 (COVID-19) and pregnancy: a systematic review.
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?:year
  • 2022

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