| Name | Info | Provider | Link |
|---|---|---|---|
| Folic Acid | free resource | MedlinePlus Health Information | https://medlineplus.gov/folicacid.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19837906.ui | |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19837906/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/19837906 | |
| subscription/membership/fee required | Wiley | https://doi.org/10.1177/0091270009339740 |