Application of B⁃ultrasound in craniotomy for patients with severe traumatic brain injury oleh Yan⁃bin LI, Shang⁃wu WANG, Xin QU, Qi⁃jun SUN, Yong⁃qiang ZHANG, Tie⁃jun HUO, Wei YAN, Hong⁃wei CHAI, Ming⁃li MAO, Yue⁃kui WU