Name Info Provider Link
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=17237965.ui
subscription/membership/fee required Springer https://dx.doi.org/10.1007/s00431-006-0362-2