Name Info Provider Link
subscription/membership/fee required Ingenta plc https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=121&issue=5&spage=1290&aulast=Tao
Childbirth free resource MedlinePlus Health Information https://medlineplus.gov/childbirth.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=26273746.ui
subscription/membership/fee required Wolters Kluwer https://doi.org/10.1213/ANE.0000000000000903