Open Access Research

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 and Holger J Schunemann

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

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