Effectiveness and Safety of Lower Doses of Mifepristone Combined With Misoprostol for the Termination of Ultra-Early Pregnancy: A Dose-Ranging Randomized Controlled Trial. - Li, Cui-Lan; Chen, Dun-Jin; Song, Li-Ping; Wang, Yan; Zhang, Zhong-Fang; Liu, Ming-Xing; Chen, Wei-Ling (Reproductive Sciences, 2015)