RT Journal Article SR Electronic T1 Seasonal variation in asthma exacerbations in the AUSTRI and VESTRI studies JF ERJ Open Research JO erjor FD European Respiratory Society SP 00153-2018 DO 10.1183/23120541.00153-2018 VO 5 IS 2 A1 Stanley J. Szefler A1 Ibrahim Raphiou A1 Robert S. Zeiger A1 David Stempel A1 Kenneth Kral A1 Steven Pascoe YR 2019 UL http://openres.ersjournals.com/content/5/2/00153-2018.abstract AB