This week at Liverpool's Alder Hey children's hospital, twoyearold twins Katie and Aimee both have preoperation tests for holes in the heart. Sixteenyearold Nadia and tenyearold Louise, who have walking problems caused by cerebral palsy, return to the hospital to take their first steps following operations on their legs, and casualty nurse Mike Callaghan deals with a teenage girl who has swallowed a 50 pence piece.

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