@misc{oai:showa.repo.nii.ac.jp:00002570,
 author = {濱田, 尚子},
 month = {2021-03-05, 2019-07-29, 2019-07-29},
 note = {2015年度},
 title = {Ultrasonographic findings of placenta lacunae and a lack of a clear zone in cases with placenta previa and normal placenta.},
 year = {}
}