Hodgson, D., Anderson, J., Reynolds, C., Meakin, G., Bailey, H., Pavord, I., …Harrison, T. W. (2015). A randomised controlled trial of small particle inhaled steroids in refractory eosinophilic asthma (SPIRA). Thorax, 70(6), 559-565. https://doi.org/10.1136/thoraxjnl-2014-206481