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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 email, Michaela Behnke email, Martin Frey email, Thomas Grueter email, Otto Brandli email, Alfred Lichtenschopf email, Gordon H Guyatt email and Holger J Schunemann email

Health and Quality of Life Outcomes 2004, 2:1doi:10.1186/1477-7525-2-1

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