Published on in Vol 20, No 6 (2018): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9275, first published
.
1 Faculty of Health, Victoria University of Wellington, Wellington, New Zealand
2 Department of Psychological Medicine, University of Auckland, Auckland, New Zealand
3 School of Health, Wellbeing and Social Care, The Open University, Milton Keynes, United Kingdom