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  1. Respiratory Symptoms Questionnaire: a new tool to assess symptoms in people with asthma and/or COPD
  2. A cross-sectional assessment of the burden of COPD symptoms in the US and Europe using the National Health and Wellness Survey
  3. Asthma-chronic obstructive pulmonary disease overlap syndrome in the urban Chinese population: prevalence and disease burden using the 2010, 2012, and 2013 China National Health and Wellness Surveys
  4. Depression symptoms reduce physical activity in COPD patients: a prospective multicenter study