RT Journal Article SR Electronic T1 Inhaled corticosteroids preventing pneumonia mortality: paradox or selection bias? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1802112 DO 10.1183/13993003.02112-2018 VO 53 IS 2 A1 Samy Suissa YR 2019 UL http://erj.ersjournals.com/content/53/2/1802112.abstract AB