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Global Initiative for Chronic Obstructive Lung Disease, Bethesda, USA
National Heart, Lung and Blood Institute, Bethesda, USA
American Lung Association, Chicago, IL, USA
J.P. Mortola, Dept of Physiology, McGill University, Montreal, QU, Canada
Textbook, National Academies of Sciences, Washington, DC, USA, 2001
University of Iowa, Iowa City, IA , USA
Book, National Academoes of Sciences, Washington, USA
Book, National Academies of Sciences, Washington, USA
McGill University
Journal, DOAJ, Kastrup, Denmark
RxList Inc., San Clemente, USA
F. Bove, Underwater Medicine Associates, inc., Bryn Mawr, USA
Doctor's Guide Publishing Limited
A.W. Grogono, Tulane University, New Orleans, USA
National Asthma Council, Melbourne, Australia
3M
G. Simon, London South Bank University, London, UK, last update 2005
MedEdu LLC, Westborough, USA
Medline Plus, US National Library of Medicine, Bethesda, USA
Journal, American Association for Respiratory Care, The Journal Respiratory Care Company, Irving, USA
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