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- Year: 2015
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- Language: English
- Year: 2016
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- Language: English
- Year: 2011
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- Language: English
- Year: 2014
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- Language: English
- Year: 2019
- Author: Daniel Koch, Martin S. Fischer
- Language: English
- Year: 2020
- Author: American College of Obstetricians and Gynecologists (ACOG)
- Language: English
- Year: 2017
- Author: World Health Organization
- Language: English
- Year: 2019