Below is a working bibliography of trusted health, pharmacovigilance, and legal-analysis sources, compiled for open research.
A Closer Look at Tysabri and Progressive Multifocal Leukoencephalopathy risk: what studies show
A focused look at the background, context, and key sources on this subject.
Reference: Mayo Clinic — Diseases & Conditions
Authoritative source for clinical, regulatory, and public-health background reading.
Reference: PubMed Central (PMC)
Authoritative source for clinical, regulatory, and public-health background reading.