@misc{10167,
  author = {J. Kaye and H. Jick},
  title = {Incidence of erectile dysfunction and characteristics of patients before and after the introduction of sildenafil in the United Kingdom: cross sectional study with comparison patients},
  year = {2003},
  journal = {Bmj},
  volume = {326},
  number = {7386},
  pages = {424-5},
  issn = {0959-8138},
  doi = {10.1136/bmj.326.7386.424},
}