Application effect of multi-frequency vibration sputum elimination machine for expectoration in children with severe pneumonia 
Gao Xianghua, Dong Bailing, Zhou Xihua
International Medicine and Health Guidance News . 2022, (12): 1706 -1710 .  DOI: 10.3760/cma.j.issn.1007-1245.2022.12.018

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