Research – Open Access Asthma Research and Practice 2018 4:7 Ryosuke Souma, Kumiya Sugiyama, Hiroyuki Masuda, Hajime Arifuku, Kentaro Nakano, Hiroyoshi Watanabe, Tomoshige Wakayama, Shingo Tokita, Masamitsu Tatewaki, Hideyuki Satoh, Kenya Koyama, Yumeko Hayashi, Fumiya Fukushima, Hirokuni Hirata, Masafumi Arima, Kazuhiro Kurasawa, Takeshi Fukuda and Yasutsugu Fukushima https://doi.org/10.1186/s40733-018-0043-8 Abstract Background The combination of budesonide + formoterol (BFC) offers the advantages of dose adjustment in a single inhaler…