@misc{indiciaea362c17f1fb3,
  title = {Plasma exchange in chronic progressive multiple sclerosis: a long-term study.},
  author = {B O Khatri and M P McQuillen and R G Hoffmann and G J Harrington and D Schmoll},
  year = {1991},
  doi = {10.1212/wnl.41.3.409},
  url = {https://pubmed.ncbi.nlm.nih.gov/2006010/},
  note = {Source identifier: 2006010}
}