1. EurostatDigital economy and society statistics - households and individuals 2016
http://ec.europa.eu/eurostat/statistics-explained/index.php/Digital_economy_and_society_statistics_-_households_and_individuals
2. EurostatMobile connection to internet 2016
http://ec.europa.eu/eurostat/statistics-explained/index.php/Mobile_connection_to_internet
3. Eurostat2016Internet use by individuals
http://ec.europa.eu/eurostat/documents/2995521/7771139/9-20122016-BP-EN.pdf/f023d81a-dce2-4959-93e3-8cc7082b6edd
4. Business InsiderIQVIA Institute for Human Data Science Study: Impact of Digital Health Grows as Innovation, Evidence and Adoption of Mobile Health Apps Accelerate 2017
https://tinyurl.com/y7qamjat
5. Patient Self-Management of Asthma Using Mobile Health Applications: A Systematic Review of the Functionalities and Effects