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Comparison of vaginal and sublingual misoprostol for second trimester abortion: randomized controlled equivalence trial.
von Hertzen H, Piaggio G, Wojdyla D, Nguyen TM, Marions L, Okoev G, Khomassuridze A, Kereszturi A, Mittal S, Nair R, Daver R, Pretnar-Darovec A, Dickson K, Nguyen DH, Nguyen HB, Hoang TD, Peregoudov A; WHO Research Group on Post-ovulatory Methods of Fertility Regulation. von Hertzen H, et al. Hum Reprod. 2009 Jan;24(1):106-12. doi: 10.1093/humrep/den328. Epub 2008 Sep 14. Hum Reprod. 2009. PMID: 18794161 Clinical Trial.