@article{Ouvarovskaia:71046,
      author        = "Ouvarovskaia, V. and Portillo, K. and Delgado, M.T. and
                       Requeno, M.N. and Torrente, J.I. and Pinilla, M. and
                       Aranda, C. and Perez, M.P.",
      title         = "{Deficiencia de vitamina B12 en diabéticos tipo 2
                       tratados con metformina}",
      year          = "2013",
}