RT Journal Article SR Electronic T1 Protein levels, air pollution and vitamin D deficiency: links with allergy JF ERJ Open Research JO erjor FD European Respiratory Society SP 00237-2021 DO 10.1183/23120541.00237-2021 VO 7 IS 4 A1 Song, Yong A1 Walters, E. Haydn A1 Abramson, Michael J. A1 Bowatte, Gayan A1 Bui, Dinh S. A1 Perret, Jennifer A1 Feather, Iain A1 Knibbs, Luke D. A1 Wilson, Richard A1 Nichols, David S. A1 Dharmage, Shyamali C. A1 Zosky, Graeme R. YR 2021 UL https://publications.ersnet.org//content/7/4/00237-2021.abstract AB