Published on in Vol 9, No 9 (2020): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/18071, first published
.

1 The National Institute for Health Innovation, The University of Auckland , Auckland , NZ
2 School of Population Health, The University of Auckland , Auckland , NZ
3 Centre for Tobacco Control Research, School of Medicine, The Zhejiang University, Hangzhou , CN