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Influence of socioeconomic and demographic status on spirometry testing in patients initiating medication targeting obstructive lung disease: a population-based cohort study

Mette M Koefoed*, Jens Søndergaard, René dePont Christensen and Dorte E Jarbøl

BMC Public Health 2013, 13:580  doi:10.1186/1471-2458-13-580

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