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Seriolo, B., Molfetta, L. & Cutolo, M. Seasonal variations in serum levels of 25-hydroxyvitamin D in patients with systemic sclerosis. Clin Rheumatol 30, 445–446 (2011). https://doi.org/10.1007/s10067-011-1684-7
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DOI: https://doi.org/10.1007/s10067-011-1684-7