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- [4] RETRACTED: Nifedipine alone or combined with sildenafil citrate for management of threatened preterm labour: a randomised trial (Publication with Expression of Concern. See vol. 127, pg. 914, 2020) (Retracted article. See vol. 128, pg. 144, 2021) BJOG-AN INTERNATIONAL JOURNAL OF OBSTETRICS AND GYNAECOLOGY, 2019, 126 (06) : 729 - 735