@article{y.x yang2019ultrasound,
  title={Transvaginal ultrasound intrauterine echo flow resistance index as predictor of lymphovascular space invasion in endometrioid adenocarcinoma},
  author={d.j. liu,x.h. bi,y.x yang},
  journal={European Journal of Gynaecological Oncology},
  volume={40},
  number={4},
  pages={652--655},
  doi = {10.12892/ejgo4776.2019},
  year={2019}
}