@article{ViolanFoguetBoreuFloresMateoetal.2014,
  author    = {Concepci{\´o} Violan and Quint{\´i} Foguet-Boreu and Gemma Flores-Mateo and Chris Salisbury and Jeanet W. Blom and Michael Freitag and Liam Glynn and Christiane Muth and Jose M. Valderas},
  title     = {Prevalence, determinants and patterns of multimorbidity in primary care : a systematic review of observational studies},
  journal   = {PLoS One},
  volume    = {9},
  number    = {(7):e102149},
  doi       = {10.1371/journal.pone.0102149},
  year      = {2014},
}