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1 Prevalence and socioeconomic burden of chronic obstructive pulmonary disease
Tai Joon An, Hyoung Kyu Yoon
J Korean Med Assoc.2018;61(9):533-538.   Published online 2018 September 18     DOI: http://dx.doi.org/10.5124/jkma.2018.61.9.533
      

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