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Continue to ChatChronic obstructive pulmonary disease phenotypes in Turkey: the COPET study-a national, multicenter cross-sectional observational study. - https://avesis.gazi.edu.tr/yayin/d79352af-e815-4f17-a311-b7b404db73e2/chronic-obstructive-pulmonary-disease-phenotypes-in-turkey-the-copet-study-a-national-multicenter-cross-sectional-observational-study