@misc{10123,
  author = {S. Varney and J. Guest},
  title = {Relative cost effectiveness of Depo-Provera, Implanon, and Mirena in reversible long-term hormonal contraception in the UK},
  year = {2004},
  journal = {Pharmacoeconomics},
  volume = {22},
  number = {17},
  pages = {1141-51},
  issn = {1170-7690 (Print) 1170-7690},
}