No abstract available
Publication types
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Comparative Study
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Letter
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Research Support, Non-U.S. Gov't
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Comment
MeSH terms
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Arthritis, Rheumatoid / blood
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Arthritis, Rheumatoid / etiology*
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Case-Control Studies
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Estonia
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Female
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Humans
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Italy
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Middle Aged
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Seasons
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Severity of Illness Index
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Sunlight
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Vitamin D / analogs & derivatives
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Vitamin D / blood
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Vitamin D / physiology*
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Vitamin D Deficiency / blood
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Vitamin D Deficiency / complications*
Substances
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Vitamin D
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25-hydroxyvitamin D