Obstructive and restrictive spirometric patterns: fixed cut-offs for FEV1/FEV6 and FEV6

J. Vandevoorde, University of Brussels (Vrije Universiteit Brussel), Dept of General Practice, Laarbeeklaan 103, B-1090 Brussels, Belgium. Fax: 32 52373311. E-mail: Jan.Vandevoorde{at}vub.ac.be

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