Published on in Vol 8, No 4 (2019): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12792, first published
.

1 National Institute for Health Innovation, School of Population Health, University of Auckland, Auckland , NZ
2 School of Population Health, University of Auckland , Auckland , NZ
3 Department of Medicine, University of Otago , Dunedin , NZ
4 Department of Women’s and Children’s Health, University of Otago , Dunedin , NZ