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Clinical characteristics of 20 elderly patients with COVID⁃19 receiving invasive mechanical ventilation：ret⁃rospective study
WANG Jiafang, ZHANG Peng, CHEN Zhijun
The Journal of Practical Medicine . 2020, (
20
): 2753 -2758 . DOI: 10.3969/j.issn.1006⁃5725.2020.20.002
