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International approaches to the prescription of long-term oxygen therapy
P.J. Wijkstra, G.H. Guyatt, N. Ambrosino, B.R. Celli, R. Güell, J.F. Muir, C. Préfaut, E.S. Mendes, I. Ferreira, P. Austin, B. Weaver, R.S. Goldstein
European Respiratory Journal 18 (6) 909-913; DOI: 10.1183/09031936.01.00202301 Published 1 December 2001