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Zanardi returns home after 18 months in hospital

Zanardi back in intensive care as condition becomes unstable

Alex Zanardi undergoes neurosurgery for a third time
Alex Zanardi

Zanardi undergoes neurosurgery for a second time
Alex Zanardi

Zanardi to remain in coma until at least next week

Alex Zanardi

Zanardi stable but not ready to be brought out of coma