Although no statistically significant difference was observed, an elevated trend could still be seen in terms of the frequency of acute exacerbation and number of patients with COPD in group E; evaluated every six months for two years, the group E cases/(A+B) cases were 4/44, 4/44, 5/43, and 7/41.
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Comparison of Clinical Characteristics and Prognosis Among Spontaneous Pneumothorax Patients of Different Ages: A Two-Year Follow-Up Study.
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