Name Info Provider Link
subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0002-9378(06)00219-5
Infections and Pregnancy free resource MedlinePlus Health Information https://medlineplus.gov/infectionsandpregnancy.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=16813750.ui