共 50 条
- [32] Trends in Unattended Home Births in the United States OBSTETRICS AND GYNECOLOGY, 2015, 125 : 75S - 75S
- [35] Preterm Births - United States, 2006 and 2010 MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT, 2013, 62 (03): : 136 - 138
- [39] Fertility and Childlessness in the United States AMERICAN ECONOMIC REVIEW, 2015, 105 (06): : 1852 - 1882