What are the symptoms of vitamin D deficiency? Can a person with vitamin D deficiency have no symptoms at all and still need supplements? - Quora
How long does it take to recover from a severe vitamin D deficiency? How soon can I start seeing the difference that the supplements and sunlight are working in me? - Quora
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Diagnostics | Free Full-Text | The Effect of Vitamin D Level on Parathyroid Hormone and Alkaline Phosphatase
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