Research progress of assessment tools for early morning symptom of patients with chronic obstructive pulmonary disease：a literature review
CAO Ling, ZHONG Yinqin, ZHANG Huihui, LÜ Haipeng, LIU Rui, WU Yueting
Chinese Journal of Nursing . 2022, (19): 2428 -2432 .  DOI: 10.3761/j.issn.0254-1769.2022.19.019

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