@article{choi_2014, 
  title={Differential Item Functioning of the Oswestry Low Back Pain Questionnaire Between Participants With and Without Low Back Pain}, 
  volume={21}, 
  DOI={10.12674/ptk.2014.21.4.040}, 
  publisher={Korean Research Society of Physical Therapy}, 
  author={Choi}, 
  year={2014}, 
  month={Nov}
  }