Biswas, M
Ades, A E
Hamilton, W
Article History
Received: 4 August 2014
Revised: 24 September 2014
Accepted: 4 November 2014
First Online: 2 December 2014
Competing interests
: WH is the clinical lead for the ongoing revision of the NICE 2005 guidance. His contribution to this article is in a personal capacity, and is not to be interpreted as representing the view of the Guideline Development Group, or of NICE itself.