作者单位:
Department of Obstetrics and Gynecology, Duke Global Health Institute, Duke University, Durham NC
[1]
Department of Biostatistics, UNC Gillings School of Public Health, Chapel Hill NC, United States
[2]
Department of Obstetrics and Gynecology, Duke University, Durham NC, United States
[3]
Department of Obstetrics and Gynecology, University of North Carolina (UNC), Chapel Hill NC, United
[4]
Family Health Ministries, Chapel Hill NC, United States
[5]
发布时间
2013-11-20