Figure 1.

![Figure 1.: Planned PRISMA flow diagram for the systematic review protocol on vitamin D supplementation in patients with alopecia areata.](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10662846/bin/medi-101-e31089-g001.jpg)

> Source: Baohua Zhu et al. "Vitamin D supplementation for patients with alopecia areata: A protocol for syst." *Medicine*, 2022. PMID: [36281137](https://pubmed.ncbi.nlm.nih.gov/36281137/)

<figure>
  <img src="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10662846/bin/medi-101-e31089-g001.jpg" alt="Planned PRISMA flow diagram for the systematic review protocol on vitamin D supplementation in patients with alopecia areata." />
  <figcaption>Figure 1.. Planned PRISMA flow diagram for the systematic review protocol on vitamin D supplementation in patients with alopecia areata.<br>  Source: Baohua Zhu et al. "Vitamin D supplementation for patients with alopecia areata: A protocol for syst." <em>Medicine</em>, 2022. PMID: <a href="https://pubmed.ncbi.nlm.nih.gov/36281137/">36281137</a></figcaption>
</figure>