1. Pew Research CenterMobile Fact Sheet Internet2018Pew Research Center: Internet, Science & Techhttp://www.pewinternet.org/fact-sheet/mobile/
2. Ofcom2017Communications Market Report
https://www.ofcom.org.uk/__data/assets/pdf_file/0017/105074/cmr-2017-uk.pdf
3. Grand View Research2018Internet of Things (IoT) in Healthcare Market Size, Share & Trend Analysis Report by Component, By Connectivity Technology, By Application, By End-use, By Region, And Segment Forecasts, 2012 - 2022
https://tinyurl.com/ybbwhr2n
4. Gartner20170207Gartner Says 8.4 Billion Connected “Things” Will Be in Use in 2017, Up 31 Percent From 2016
https://www.gartner.com/en/newsroom/press-releases/2017-02-07-gartner-says-8-billion-connected-things-will-be-in-use-in-2017-up-31-percent-from-2016
5. Health App Use Among US Mobile Phone Owners: A National Survey