Ethics and consent:
As a study of healthcare-associated infections, this investigation is
exempt from requiring ethical approval under Section 251 of the NHS Act
2006 (see also the NHS Health Research Authority algorithm, available at
http://www.hra-decisiontools.org.uk/research/, which concludes
that no formal ethical approval is required). Our study was performed as
a service evaluation of the CUHNFT screening programme. The service
provided was not changed in any way in order to undertake this
evaluation.