@article{NaglLouiRailaetal.2009,
  author    = {Britta Nagl and Andrea Loui and Jens Raila and Ursula Felderhoff-Mueser and Michael Obladen and Florian J. Schweigert},
  title     = {Urinary vitamin A excretion in very low birth weight infants},
  doi       = {10.1007/s00467-008-0965-0},
  url       = {http://www.springerlink.com/content/100382},
  year      = {2009},
}