广西壮族自治区卫生和计划生育委员会自筹经费科研课题82015137;广西壮族自治区梧州市科学研究与技术开发计划项目201502096;Self-raised Funds Sponsored Research Project of Health and Family Planning Commission of Guangxi Zhuang Autonomous Region82015137;Scientific Research and Technology Development Planning Project of Wuzhou City, Guangxi Zhuang Autonomous Region201502096