The 6 minute walk in idiopathic pulmonary fibrosis: longitudinal changes and minimum important difference.
Swigris, Jeffrey J.; Wamboldt, Frederick S.; Behr, Juergen; du Bois, Roland M.; King, Talmadge E.; Raghu, Ganesh; Brown, Kevin K.; Thorax, 2010, vol. 65, issue 2, p 173, ISSN 00406376. ISBN 14683296.

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