Smartphones for community health in rural Cambodia: A feasibility study [version 1; referees: 1 approved, 2 approved with reservations] ‌ Pengby Ngor, Lisa J. White, Jeremy Chalk, Yoel Lubell, Cecelia Favede, Phaik-Yeong Cheah, Chea Nguon, Po Ly, Richard J. Maude, Siv Sovannaroth, Nicholas P. Day, Susanna Dunachie