The standards of care at the 14 hospital trusts with the worst death rates have been investigated.

The review led by NHS England medical director Sir Bruce Keogh looked at whether the figures were being caused by failings beyond those that have already been identified by regulators. Eleven of the trusts under investigation have been placed on special measures.

Basildon and Thurrock University Hospitals NHS Foundation Trust

Buckinghamshire Healthcare NHS Trust

Burton Hospitals NHS Foundation Trust

East Lancashire Hospitals NHS Trust

George Eliot Hospital NHS Trust

Medway NHS Foundation Trust

North Cumbria University Hospitals NHS Trust (Two hospitals – Cumberland Infirmary and West Cumberland)

Northern Lincolnshire and Goole Hospitals NHS Foundation Trust (Three hospitals – Diana, Princess of Wales Hospital, Goole and District Hospital and Scunthorpe General)

Sherwood Forest Hospitals NHS Foundation Trust

Tameside Hospital NHS Foundation Trust

United Lincolnshire Hospitals NHS Trust

Blackpool Teaching Hospitals NHS Foundation Trust

Colchester Hospital University NHS Foundation Trust

The Dudley Group NHS Foundation Trust

Follow this link to the BBC News website for a breakdown of what has been said about each.