@article{17752,
  author = {Mackay G. and Kamper S. and Maher C.},
  title = {Global rating of change scales: a review of strengths and weaknesses and considerations for design},
  year = {2009},
  journal = {Journal of Manual and Manipulative Therapy},
  volume = {17},
  number = {3},
  pages = {163-70. },
  language = {eng},
}