@article{s. matsubara2014on,
  title={Controversy on another possible risk of preterm delivery after cervical conization: time interval between conization and conception},
  author={s. matsubara,r. usui,a. ohkuchi},
  journal={European Journal of Gynaecological Oncology},
  volume={35},
  number={1},
  pages={5--6},
  doi = {10.12892/ejgo25502014},
  year={2014}
}