Below is a working bibliography of trusted health, pharmacovigilance, and legal-analysis sources, compiled for open research.
Tysabri and Progressive Multifocal Leukoencephalopathy risk: what studies show
A focused review of background, context, and source material on this subject.
Reference: Mayo Clinic — Diseases & Conditions
Authoritative source for clinical, regulatory, and public-health background reading.
Reference: ClinicalTrials.gov
Authoritative source for clinical, regulatory, and public-health background reading.
Reference: Wikipedia: Medical Malpractice
Authoritative source for clinical, regulatory, and public-health background reading.