1. Klasnja P, Pratt W. Healthcare in the pocket: mapping the space of mobile-phone health interventions. J Biomed Inform. 2011;45:184–98.
2. Ofcom. The communications market 2014 (August). 2014. http://stakeholders.ofcom.org.uk/market-data-research/market-data/communications-market-reports/cmr14/ .
3. Pew Research Internet Project. Mobile technology fact sheet. http://www.pewinternet.org/fact-sheets/mobile-technology-fact-sheet/ .
4. Fox S, Duggan M. Mobile health 2012. Washington DC: Pew Research Center; 2012.
5. research2guidance. Mobile health market report 2013–2017. http://www.research2guidance.com/shop/index.php/mhealth-report-2 .