People who have surgery towards the end of the week are more likely to die than those who have procedures earlier on, researchers say.
A British Medical Journal report into non-emergency operations in England, suggests the overall risk of death from such planned procedures remains low.
But it shows "unacceptable" variation in survival rates through the week, a leading body of UK surgeons says.
The government says it is committed to safe care for patients at all times.
http://www.bbc.co.uk/news/health-22687599