广西壮族自治区卫生和计划生育委员会计划课题Z2016108;广西壮族自治区妇幼保健育苗计划课题GXWCH-YMJH-2017009Plan Project of Guangxi Zhuang Autonomous Region Health and Family Planning CommissionZ2016108;Plan Project of Maternal and Child Health Care of Guangxi Zhuang Autonomous RegionGXWCH-YMJH-2017009