© The Author(s) (published by BMJ Publishing Group) (open access journal)

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Authors retain copyright of their work. Articles are published under Creative Commons licences, including licences that meet RCUK and Wellcome Trust requirements. Our full licence is here.

Publishing in BMJ Open enables you to fulfil the open access requirements of the Wellcome Trust and Research Councils UK, including using their preferred CC BY licence.

Verification Date:

  14.01.2015