Protocol shift from agonist to antagonist or vice versa after an unsuccessful intracytoplasmic sperm injection cycle on the same patient does not improve outcome by Yavuz Emre Şükür, Can Ozan Ulusoy, Batuhan Özmen, Murat Sönmezer, Bülent Berker, Ruşen Aytaç, Cem Somer Atabekoğlu

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