article 2005 Pregnancy and Implantation Rates of Donor Oocyte Recipients Obtaining Oocytes from Infertile Donors with Unexplained Infertility are Comparable to the Rates Obtained from Oocytes from Donors Whose Infertility Etiology is Tubal or Male Factor ·doi:10.1016/j.fertnstert.2005.01.074