[Size of sample in clinical investigation].

@article{Alpzar2009SizeOS,
  title={[Size of sample in clinical investigation].},
  author={Carlomagno Araya Alp{\'i}zar and M Purificaci{\'o}n Galindo Villard{\'o}n},
  journal={Medicina clinica},
  year={2009},
  volume={133 1},
  pages={26-30}
}