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 Yong Song A1 E. Haydn Walters A1 Michael J. Abramson A1 Gayan Bowatte A1 Dinh S. Bui A1 Jennifer Perret A1 Iain Feather A1 Luke D. Knibbs A1 Richard Wilson A1 David S. Nichols A1 Shyamali C. Dharmage A1 Graeme R. Zosky YR 2021 UL http://openres.ersjournals.com/content/7/4/00237-2021.abstract AB