@article{17646,
  author = {Knottnerus J. and Smeets R. and Vlaeyen J. and Severens J. and Beelen S.},
  title = {More is not always better: cost-effectiveness analysis of combined, single behavioral and single physical rehabilitation programs for chronic low back pain.},
  year = {2009},
  journal = {European Journal of Pain},
  volume = {13},
  number = {1},
  pages = {71-81. },
  language = {eng},
}