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Original Research
Severe COPD cases from Korea, Poland, and USA have substantial differences in respiratory symptoms and other respiratory illnesses
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17,341 | Dovepress* | 16,921+ | 1,439 | 18,360 | |
PubMed Central* | 420 | 153 | 573 | ||
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6 | 1 | 0 | 0 | 2 | 3 |
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