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Self-administration and interviewer-administration of the German Chronic Respiratory Questionnaire: instrument development and assessment of validity and reliability in two randomised studies
Milo A Puhan, Michaela Behnke, Martin Frey, Thomas Grueter, Otto Brandli, Alfred Lichtenschopf, Gordon H Guyatt, Holger J SchunemannVolume:
2
Language:
english
DOI:
10.1186/1477-7525-2-1
Date:
December, 2004
File:
PDF, 535 KB
english, 2004