Sopo, S. M., Cerchiara, G., Bersani, G., Monaco, S., Romano, A., & Poscia, A. (2019). The unpredictability of seasonal variations in serum vitamin D levels in children with asthma and/or rhinitis. Allergologia Et Immunopathologia, 47(5), 411-416. https://all-imm.com/index.php/aei/article/view/283