RT Journal Article SR Electronic T1 Ambulatory oxygen in idiopathic pulmonary fibrosis: of what benefit? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 269 OP 270 DO 10.1183/09031936.00007712 VO 40 IS 1 A1 Frank, Rebecca C. A1 Hicks, Sophie A1 Duck, Annette M. A1 Spencer, Lisa A1 Leonard, Colm T. A1 Barnett, Emma YR 2012 UL http://erj.ersjournals.com/content/40/1/269.abstract AB