@misc{8000,
  author = {Y. Vinogradova and C. Coupland and J. Hippisley-Cox},
  title = {Use of hormone replacement therapy and risk of breast cancer: nested case-control studies using the QResearch and CPRD databases},
  year = {2020},
  journal = {Bmj},
  volume = {371},
  pages = {m3873},
  issn = {0959-8138 (Print) 0959-8138},
  doi = {10.1136/bmj.m3873},
}