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Lookup NU author(s): Professor Allyson PollockORCiD,
This is the final published version of an article that has been published in its final definitive form by BMJ Group, 2017.
For re-use rights please refer to the publisher's terms and conditions.
Author(s): Pollock AM, Roderick P
Publication type: Article
Publication status: Published
Print publication date: 25/11/2017
Online publication date: 22/11/2017
Acceptance date: 13/11/2017
Date deposited: 16/01/2018
ISSN (print): 0959-535X
ISSN (electronic): 1756-1833
Publisher: BMJ Group
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