| Name | Info | Provider | Link |
|---|---|---|---|
| Vitamin D Deficiency | free resource | MedlinePlus Health Information | https://medlineplus.gov/vitaminddeficiency.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22869836/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/22869836 | |
| subscription/membership/fee required | Silverchair Information Systems | https://publications.aap.org/pediatrics/article-lookup/doi/10.1542/peds.2011-3328 |