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Patterns and determinants of COPD-related healthcare utilization by severity of airway obstruction in Korea. http://t.co/v2IMwF4mRk
Patterns and determinants of COPD-related healthcare utilization by severity of airway obstruction in Korea. http://t.co/v2IMwF4mRk
Patterns and determinants of COPD-related healthcare utilization by severity of airway obstruction in Korea... http://t.co/ahdeghVf15
Patterns and determinants of COPD-related healthcare utilization by severity of airway obstruction in Korea: C... http://t.co/jNqM3obuzl