@misc{indiciae4767cc4c328c,
  title = {Back pain.},
  author = {S Hoppenfeld},
  year = {1977},
  doi = {10.1016/s0031-3955(16)33505-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/144893/},
  note = {Source identifier: 144893}
}