Name	Info	Provider	Link
	free resource	BioMed Central	https://bmcpregnancychildbirth.biomedcentral.com/articles/10.1186/s12884-021-03709-5
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33743637/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33743637
	free resource	scite Smart Citations	https://scite.ai/reports/33743637