RT Journal Article SR Electronic T1 Cyclophosphamide in steroid refractory unclassifiable idiopathic interstitial pneumonia and interstitial pneumonia with autoimmune features (IPAF) JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1702519 DO 10.1183/13993003.02519-2017 A1 Ivo A. Wiertz A1 Coline H.M. van Moorsel A1 Adriane D.M. Vorselaars A1 Marian J.R. Quanjel A1 Jan C. Grutters YR 2018 UL http://erj.ersjournals.com/content/early/2018/02/15/13993003.02519-2017.abstract AB