国家临床重点专科建设项目-神经内科;国家临床重点专科建设项目-重症医学科;国家高技术研究发展计划863计划项目项目编号:2015AA020514This study was supported by National Key Department of Neurology and Critical Care Medicine Funded by National Health and Family Planning Commission of the People's Republic of China, and National High Technology Research and Development Prog863 Program, 2015AA020514