海量图书期刊资源，随时随地畅享阅读乐趣
Termination of early gestation with the anti-progestin steroid RU 486: Medium versus low doseD.R. Mishell Jr.; D. Shoupe; P.F. Brenner; M. Lacarra; J. Horenstein; P. Lahteenmaki; I.M. Spitz · 1987