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Because the practice of preimplantation sex selection is ethically controversial, clinics are encouraged to develop and make available their policies regarding its use. Practitioners offering assisted reproductive services are under no ethical obligation to provide or refuse to provide nonmedically-indicated methods of sex selection. This document replaces the document of the same name, last published in 2015. To investigate whether endometrial scratching increases the chance of live birth in women with unexplained infertility attempting t