Funding for this research was provided by:
Wellcome Trust (098521)
Wellcome Trust (0973330/Z/11/Z)
Wellcome Trust (105609/Z/14/Z)
Fred Hollows Foundation (1041, 1954-0)
Sightsavers International (203145)
Received: 17 November 2017
Accepted: 29 January 2018
First Online: 21 February 2018
Ethics approval and consent to participate
: The study adhered to the tenets of the Declaration of Helsinki. The study was approved by the London School of Hygiene & Tropical Medicine Ethics Committee (6319, 10145 and 13460; approved 21/12/2012, 13/06/2015 and 10/05/2017, respectively) and the Solomon Islands National Health Research Ethics Committee (HRC13/18; approved 23/08/2013). Written consent to take part was granted on behalf of each child by a parent or guardian.
: Not applicable.
: The authors declare that they have no competing interests.
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