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- https://www.dermnetnz.org/topics/vitamin-a-deficiency/
- https://food.ndtv.com/health/5-hidden-signs-and-symptoms-of-vitamin-a-deficiency-often-ignored-1664573
- https://www.healthline.com/nutrition/vitamin-a-deficiency-symptoms#section1
- https://www.ncbi.nlm.nih.gov/pubmed/15699236
- https://www.mdpi.com/2072-6643/3/4/385/htm
- https://www.ncbi.nlm.nih.gov/pubmed/9857484
- https://www.ncbi.nlm.nih.gov/pubmed/12640379
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