A cross-sectional survey on the lung ultrasound training and practice of respiratory therapists in mainland China oleh Kai Liu, Yu-long Yao, Yu-xian Wang, Bi-lin Wei, Liu-cun Li, Qi-xing Wang, Hui-qing Ge, Er-shan Wang, Li-min Yang, Huan Chen, Yun-qing Yang, Hao Qin, Wen-jun Zhai, Shen-ji Yu, Xiao-ting Wang, Zhe Luo, Guo-wei Tu