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Over a year ago, Carl was diagnosed with vasculitis, an autoimmune disorder that inflames blood vessels, causing exhaustion and chronic pain.

Mr Johnson said his mother, a nurse who continued working until her final months, was terminally ill with vasculitis, a condition that attacks the vital organs, which left her in agony.

As a young researcher at the National Institutes of Health, he helped develop highly effective therapies for rare but once-fatal blood vessel diseases known as vasculitis syndromes.

Ashton Kutcher revealed he lost his sight and hearing due to vasculitis, an autoimmune issue that causes inflammation of blood vessels.

“I am still struggling with the consequences of the vasculitis I was diagnosed with in the spring, and with this decision I am following the advice of my attending physicians,” he said in the statement.