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A lung recipient bonds with the donor's family

9 August 2013 Last updated at 21:38 BST

In 2008 Gavin Maitland underwent a life-saving double lung transplant.

Five years later he swam from Alcatraz Island to San Francisco accompanied by his son and daughter - a feat that mirrored his journey back from the brink of death.

Gavin talks about his relationship with the family of the 21-year-old whose death enabled him to live.

Produced by the BBC's Anna Bressanin.