Based on the theory of Italian neurologist Dr. Paolo Zamboni, liberation therapy claims the narrowing or blockage of veins in the neck that drain blood from the brain may cause MS symptoms.

The push for clinical trials in Canada is increasing as some patients who underwent the operation at their own expense in Europe claim their lives have changed for the better. Others, however, maintain their belief that the currently unproven multiple-sclerosis procedure simply does not work.

As the fight between those for and those against CCSVI clinical trials in Canada continues, Global News takes an in-depth look into the heated argument surrounding multiple sclerosis.