RT Journal Article SR Electronic T1 Can vitamin D3 supplementation reduce the time to severe asthma exacerbations in children with asthma? JF Breathe JO Breathe FD European Respiratory Society SP 210071 DO 10.1183/20734735.0071-2021 VO 17 IS 3 A1 Idan Bokobza A1 Nour El Hadi A1 Andrew Bush A1 Heidi Makrinioti YR 2021 UL http://breathe.ersjournals.com/content/17/3/210071.abstract AB