@misc{9372,
  author = {E. Hak and K. Shea and S. Jick},
  title = {Association of infant pneumococcal vaccination with pneumococcal pneumonia among mothers: a nested case-control study using the GPRD},
  year = {2013},
  journal = {Vaccine},
  volume = {31},
  number = {12},
  pages = {1590-6},
  issn = {0264-410x},
  doi = {10.1016/j.vaccine.2013.01.018},
}