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Lookup NU author(s): Professor Luke ValeORCiD
This is the final published version of an article that has been published in its final definitive form by BMJ Group, 2011.
For re-use rights please refer to the publisher's terms and conditions.
Author(s): Cook JA, Ramsay CR, Vale LD
Publication type: Article
Publication status: Published
Journal: BMJ
Year: 2011
Volume: 343
Print publication date: 25/07/2011
Date deposited: 16/10/2012
ISSN (print): 0959-535X
ISSN (electronic): 1756-1833
Publisher: BMJ Group
URL: http://dx.doi.org/10.1136/bmj.d4375
DOI: 10.1136/bmj.d4375
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