A study protocol for investigating the sonographic characteristics of neonates with critical illness: an observational cohort study by Yan Li, Jingyi Zhang, Xiaolong Zhang, Lin Zhu, Yuan Wang, Xia Chen, Tiantian Xiao, Xiaofeng Zhou, Biao Li, Yiyong Fu, Huaying Li, Linping Zhong, Gaoyang Qin, Xin Zou, Minsheng Zheng, Pinli Zou, Youning Hu, Nana Wu, Shuqiang Gao, Xuhong Hu, Xiaohong Luo, Rong Ju

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