@inbook{19669,
  author = {Cummings P. and Cummings P. and Koepsell T. and Koepsell T. and Maier R. and Maier R. and Rivara F. and Rivara F. and Grossman D. and Norton R},
  title = {Chapter 5. Rates and denominators},
  year = {2001},
  journal = {In: Injury Control: a Guide to Research and Evaluation},
  publisher = {Cambridge University Press},
  address = {London},
  language = {eng},
}