Neoadjuvant letrozole in postmenopausal estrogen and/or progesterone receptor positive breast cancer: A phase IIb/III trial to investigate optimal duration of preoperative endocrin... by Bastert Gunther, Jänicke Fritz, Tulusan Augustinus H, Wallwiener Diethelm, Lichtenegger Werner, Krainick-Strobel Ute E, Kiesel Ludwig, Wackwitz Birgit, Paepke Stefan

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