@article{461857,
      author = {Eldridge, Sandra. and Kerry, Sally M.},
      url = {http://library.usi.edu/record/461857},
      title = {A practical guide to cluster randomised trials in health  services research [electronic resource] /},
      publisher = {John Wiley & Sons,},
      recid = {461857},
      pages = {xx, 278 p.},
      address = {Chichester, West Sussex :},
      year = {2012},
}