Effects of head direction during prone position on postoperative delirium in elderly patients undergoing thoracolumbar spine surgery: a study protocol for a randomised controlled t... gan Fang Wang, Feng Li, Qian Chen, Hong Ma, Bin Qian, Jixiang Zhu, Yongzhuang Chen, Yangyang Chen, Fengyun Liu, Xuetai Chen, Zhouya Xue, Kun Ni

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