@article{6388,
  author = {Ron Berghmans and Harry C. Schouten},
  title = {Sir Karl Popper, swans, and the general practitioner.},
  year = {2011},
  journal = {BMJ},
  volume = {343},
  pages = {d5469},
  month = {10/2011},
  issn = {1756-1833},
  doi = {10.1136/bmj.d5469},
  language = {eng},
}