Funding for this research was provided by:
Wellcome Trust (209142/Z/17/Z)
Bill and Melinda Gates Foundation (OPP1176062)
UK Department of Health, Fleming Fund (CRR00100)
Text and Data Mining valid from 2018-06-04
Received: 23 April 2018
Accepted: 11 May 2018
First Online: 4 June 2018
: The authors declare that they have no competing interest.
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