Published on in Vol 21 , No 7 (2019) :July
Preprints (earlier versions) of this paper are available at https://preprints.jmir.org/preprint/13664, first published .
1 Department of Psychological Medicine, The University of Auckland, Auckland, NZ
2 Department of Psychiatry, Harvard Medical School, Boston, MA, US
3 Benson-Henry Institute for Mind Body Medicine, Massachusetts General Hospital, Boston, MA, US
4 Auckland Bioengineering Institute, The University of Auckland, Auckland, NZ