@article{ref1,
  author = "A. Kansy and J. P. Jacobs and A. Pastuszko and M. Mirkowicz-Małek and M. Manowska and E. Jezierska and P. Maruszewski and P. Burczyński and B. Maruszewski",
  title = "Major Infection After Pediatric Cardiac Surgery: External Validation of Risk Estimation Model",
  year = 2012,
  journal = "The Annals of Thoracic Surgery",
  publisher = "Elsevier",
  volume = 94,
  number = 6,
  pages = "2091-2095",
  month = "Dec",
  doi = "10.1016/j.athoracsur.2012.07.079",
  url = "http://dx.doi.org/10.1016/j.athoracsur.2012.07.079"
}