RT Journal Article SR Electronic T1 Long-term oxygen therapy: do current guidelines need revision? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1209 OP 1210 DO 10.1034/j.1399-3003.1999.13e44.x VO 13 IS 5 A1 E Weitzenblum A1 A Chaouat A1 R Kessler YR 1999 UL http://erj.ersjournals.com/content/13/5/1209.abstract AB