@misc{indiciae3a956dabe1c5,
  title = {Psychological functioning in primary progressive versus secondary progressive multiple sclerosis.},
  author = {L Vleugels and L Pfennings and F Pouwer and L Cohen and P Ketelaer and C Polman and G Lankhorst and H van der Ploeg},
  year = {1998},
  doi = {10.1111/j.2044-8341.1998.tb01370.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/9561309/},
  note = {Source identifier: 9561309}
}