©Sagar Joglekar, Nishanth Sastry, Neil S Coulson, Stephanie JC Taylor, Anita Patel, Robbie Duschinsky, Amrutha Anand, Matt Jameson Evans, Chris J Griffiths, Aziz Sheikh, Pietro Panzarasa, Anna De Simoni. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 04.09.2018.