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Effect of maternal age on pregnancy: a retrospective cohort study |
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| Authors: | Liu Xiaoli and Zhang Weiyuan |
| Affiliation: | Department of Obstetrics,Beijing Obstetrics and Gynecology Hospital,Capital Medical University,Beijing 100026,China |
| Abstract: | advanced maternal age teenage pregnancy maternal outcome neonatal outcome |
| Keywords: | advanced maternal age teenage pregnancy maternal outcome neonatal outcome |
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