Prevalence of obstetric complications including placenta abnormality in pregnancies achieved by oocyte donation in our institution. (November 2019) - Takahashi, Naoko; Miyake, Tatsuya; Ito, Futa; Kanda, Masako; Takaoka, Sachi; Handa, Mika; Nakamura, Hitomi; Takiuchi, Tsuyoshi; Kimura, Tadashi