Name Info Provider Link
subscription/membership/fee required American Psychological Association http://content.apa.org/journals/hea/40/2/77
Vaccines free resource MedlinePlus Health Information https://medlineplus.gov/vaccines.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=33475414.ui
free resource scite Smart Citations https://scite.ai/reports/33475414