Skill training of rapid diagnosis of common emergency ultrasound in primary medical unitRen Liu-qiong, Shan Xue-xia, Wu Sheng-zheng, Lin Xing-xi, Zhang Bing-qi, Zhao Yuan-yuan, Huang Yu-qing, Hu Jian-qiu, Chen Xiang-hui, Zhao Shi-yue, Ji Bo, Song Shu, Zhao Li, Liu Xiao-xiao, Shao Yuan-kun, Li Ke-yan, Wu Du-du, Lin Hai-dan, Wang Li-bo, Tang Jie, Lv Fa-qin