北京市属医院科研培育计划PX2017053;北京妇产医院中青年学科骨干培养专项fcyy201427;首都临床特色应用研究与成果推广Z161100000516143;北京市医院管理局临床技术创新项目扬帆项目XMLX201710.This study was supported by Beijing Municipal Administration of Hospitals Incubating ProgramPX2017053;Beijing Obstetrics and Gynecology Hospital;Capital Medical Universityfcyy201427;Beijing Municipal Science and Technology CommissionZ161100000516143;Beijing Municipal Administration of Hospitals Clinical medicine Development of special funding supportXMLX201710