Effect of ultrasound-guided individualized positive end-expiratory pressure on the severity of postoperative atelectasis in elderly patients: a randomized controlled study by Junyang Ma, Meiqi Sun, Fengxiang Song, Aiqi Wang, Xiaoxia Tian, Yanan Wu, Lu Wang, Qian Zhao, Bin Liu, Shengfu Wang, Yuxue Qiu, Haitao Hou, Liqin Deng

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