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free resource Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0022-3166(22)01067-7
Pregnancy free resource MedlinePlus Health Information https://medlineplus.gov/pregnancy.html
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free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25122647/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/25122647
free resource scite Smart Citations https://scite.ai/reports/25122647
subscription/membership/fee required Silverchair Information Systems https://academic.oup.com/jn/article-lookup/doi/10.3945/jn.114.194472