1. Statista – The statistics portal. Number of smartphone users in the United States from 2010 to 2019. Available at: http://www.statista.com/statistics/201182/forecast-of-smartphone-users-in-the-us//. Accessed November 2, 2016.
2. United States Census Bureau. Available at: http://www.census.gov/popclock/. Accessed November 2, 2016.
3. Pew Research Center. Available at: http://www.pewinternet.org/2015/11/10/the-majority-of-smartphone-owners-download-apps/. Accessed November 2, 2016.
4. Mobile medical and health apps: state of the art, concerns, regulatory control and certification;Boulos;Online J Public Health Inform,2014
5. Pelletier SG. Explosive growth in health care apps raises oversight questions. AAMC Reporter (2012). Available at: https://www.aamc.org/newsroom/reporter/october2012/308516/health-care-apps.html. Accessed November 2, 2016.