河北省卫生计生委医学科学研究重点课题20150058;河北省科技支撑计划项目152777237;河北省张家口市科技局指令性计划1311055D Supported by Medical Science Research Project From Hebei Province Health Department20150058;Scientific Research Project From Scientific and Technology Agency152777237;Mandatory Planing Project from Scientific and Technology Bureau of Zhangjiakou1311055D