References:
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https://cam.cochrane.org/pregnancy-supplements#vitamina_pregnancy
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https://www.nhs.uk/conditions/pregnancy-and-baby/vitamins-minerals-supplements-pregnant/
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https://www.webmd.com/baby/get-the-calcium-you-need-during-pregnancy#1
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https://americanpregnancy.org/pregnancy-health/omega-3-fish-oil/
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https://www.who.int/elena/titles/review_summaries/vitaminC-pregnancy/en/