作者单位:
Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[1]
Univ Calif San Francisco, Dept Obstet Gynecol & Reprod Sci, San Francisco, CA USA
[2]
Washington Hosp Ctr, Dept Obstet & Gynecol, 106 Irving St,POB 108, Washington, DC 20010 USA
[3]
Univ Calif San Francisco, Dept Pediat, San Francisco, CA USA
[4]
发布时间
2017-04-05