Name Info Provider Link
free resource Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0002-9378(20)30224-6
Prenatal Care free resource MedlinePlus Health Information https://medlineplus.gov/prenatalcare.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=32112732.ui