Randomized controlled trials-an indispensible part of clinical research.

@article{Stang2011RandomizedCT,
  title={Randomized controlled trials-an indispensible part of clinical research.},
  author={Andreas Stang},
  journal={Deutsches Arzteblatt international},
  year={2011},
  volume={108 39},
  pages={661-2}
}