Funding for this research was provided by:
Ministry of Health, New Zealand (354383)
Received: 1 June 2018
Accepted: 3 January 2019
First Online: 4 March 2019
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving human subjects/patients were approved by the Northern B Health and Disability Ethics Committee (16/NTB/101) on 5 July 2016. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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