Additional file 1: of Corticosteroid plus β2-agonist in a single inhaler as reliever therapy in intermittent and mild asthma: a proof-of-concept systematic review and meta-analysis WangGang ZhangXin ZhangHong WangLei KangDe BarnesPeter 2017 The online material of corticosteroid plus β2-agonist in a single inhaler as reliever therapy in intermittent and mild asthma: A proof-of-concept systematic review and meta-analysis. (DOCX 80 kb)