@article{janssens2004-14871636,
  author  = {Janssens, J. P. and Krause, K. H.},
  title   = {{Pneumonia in the very old}},
  journal = {The Lancet. Infectious diseases},
  year    = {2004},
  doi     = {10.1016/s1473-3099(04)00931-4},
  pmid    = {14871636},
  url     = {https://doi.org/10.1016/s1473-3099(04)00931-4}
}