Distribution of COPD Comorbidities and Creation of Acute Exacerbation Risk Score: Results from SCICP by Ge H, Liu X, Gu W, Feng X, Zhang F, Han F, Qian Y, Jin X, Gao B, Yu L, Bao H, Zhou M, Li S, Jie Z, Wang J, Chen Z, Hang J, Zhang J, Zhu H

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