Call for hospital death rates investigation in Wales
20 February 2014 Last updated at 15:45 GMT
Persistently high death rates in hospitals in Wales should be investigated, the medical director of the NHS in England has suggested to his Welsh counterpart.
The NHS England medical director said the data on death rates in six Welsh hospitals was worrying but not adequate to "form a view".
His call for an investigation was made in an email last November now released under the Freedom of Information Act.
The Welsh government says the data for England and Wales cannot be compared.