RT Journal Article SR Electronic T1 Asthmatics with high levels of serum surfactant protein D have more severe disease JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1864 OP 1867 DO 10.1183/13993003.02142-2015 VO 47 IS 6 A1 Alida Benfante A1 Salvatore Battaglia A1 Stefania Principe A1 Chiara Di Mitri A1 Alessandra PaternĂ² A1 Mario Spatafora A1 Nicola Scichilone YR 2016 UL http://erj.ersjournals.com/content/47/6/1864.abstract AB