Does sequential embryo transfer improve pregnancy rate in patients with repeated implantation failure? A randomized control study. - Ismail Madkour, Wael A.; Noah, Bassel; Zaheer, Hena; Al-Bahr, Awatif; Abdelhamid, Amr M. S.; Shaeer, Mahmoud; Moawad, Ashraf (Middle East Fertility Society Journal, 2015)