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ORIGINAL RESEARCH

Association Between Blood Urea Nitrogen Levels and Length of Stay in Patients with Pneumonic Chronic Obstructive Pulmonary Disease Exacerbation: A Secondary Analysis Based on a Multicentre, Retrospective Cohort Study

Jie Du1 Department of Health Examination Center, Shaanxi Provincial People Hospital, Xi’an, People’s Republic of ChinaView further author information

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Jing Niu1 Department of Health Examination Center, Shaanxi Provincial People Hospital, Xi’an, People’s Republic of ChinaView further author information

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Lanxiang Ma2 Department of Cardiology, Shaanxi Provincial Corps Hospital, Chinese People’s Armed Police Forces, Xi’an, People’s Republic of ChinaCorrespondence[email protected]
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Yongjie Sui1 Department of Health Examination Center, Shaanxi Provincial People Hospital, Xi’an, People’s Republic of ChinaView further author information

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Shuili Wang3 Department of Respiratory Medicine, Shaanxi Provincial People Hospital, Xi’an, People’s Republic of ChinaView further author information