@article{a. pantidou2004changes,
  title={Mammographic changes during postmenopausal hormonal replacement therapy with tibolone},
  author={a. pantidou,k. kaplanis,i. chrissogonidis,c. destouni},
  journal={European Journal of Gynaecological Oncology},
  volume={25},
  number={4},
  pages={493--494},
  doi = {10.12892/ejgo200404493},
  year={2004}
}