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| Effect of Ambroxol Hydrochloride Combined with Piperacillin Sodium and Tazobactam Sodium on the Elderly Patients with Acute Exacerbation of Chronic Obstructive Pulmonary Disease |
| YANG Qian, WANG Ting, LIAN Shuimei, KANG Weifang, WANG Yongli |
| First-author's address: Department of Geriatrics, Nanping First Hospital, Nanping 353000, China |
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