**Chapter 13**

*Vitamin D Deficiency*

[130] Stefanic M, Tokic S. Serum 25-hydoxyvitamin D concentrations in relation to Hashimoto's thyroiditis: A systematic review, meta-analysis and meta-regression of observational studies. European Journal of Nutrition.

2019. DOI: 10.1007/s00394-019- 01991-w. [Epub ahead of print]

[131] An L, Sun MH, Chen F, Li JR. Vitamin D levels in systemic sclerosis patients: A meta-analysis. Drug Design, Development and Therapy.

2017;**11**:3119-3125

**246**
