| Name | Info | Provider | Link |
|---|---|---|---|
| Vitamin D Deficiency | free resource | MedlinePlus Health Information | https://medlineplus.gov/vitaminddeficiency.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=22367532.ui | |
| subscription/membership/fee required | Silverchair Information Systems | https://academic.oup.com/jbcr/article-lookup/doi/10.1097/BCR.0b013e31824d1c2c |