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Interleukin (IL)‐33 in nasopharyngeal fluid (NPF) is correlated directly with serum 25(OH)‐vitamin D3 (25(OH)‐VitD3) in asthmatic children. (a,b) Human IL‐33 (hIL‐33) enzyme‐linked immunosorbent assay (ELISA): NPF B0, VitD3 serum B0; control n = 14; asthma n = 17; linear regression.
