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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Mean values with standard deviation of annual exacerbations number. (a) and blood eosinophils count; (b) before and after vitamin D supplementation in patients adherent and non-adherent to vitamin D supplementation.