Conflict of interest statement
All authors declare that they have no conflict of interest.
Acknowledgements
This paper is a contribution from the National Cancer
Intelligence Network and is based on the information collected
and quality assured by the regional cancer registries in England
(http://www.ukacr.org; http://www.ncin.org.uk).
This work was carried out by the Thames Cancer Registry, King’s
College London, which receives funding from the Department of
Health; the views expressed in this publication are those of the
authors and not necessarily those of the Department of Health