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2. Medical methods for first-trimester abortion;Kulier;Cochrane Database Syst Rev,2011
3. Second trimester induction of labor;Vargas;Clin Obstet Gynecol,2009
4. Medical methods for mid trimester termination of pregnancy;Wildschut;Cochrane Database Syst Rev,2011
5. Society of Family Planning. Labor induction abortion in the second trimester;Borgatta;Contraception,2011