Name Info Provider Link
Pregnancy free resource MedlinePlus Health Information https://medlineplus.gov/pregnancy.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=15035552.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/15035552/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/15035552