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![PDF] Calculation of the Sun exposure time for the synthesis of vitamin D in Urcuquí, Ecuador | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/19b8c60cede885a862b57285f5fc8f8a266b63f6/4-Table2-1.png "PDF] Calculation of the Sun exposure time for the synthesis of vitamin D in Urcuquí, Ecuador | Semantic Scholar")
PDF] Calculation of the Sun exposure time for the synthesis of vitamin D in Urcuquí, Ecuador | Semantic Scholar
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