1. Adherence to medication;Osterberg;N Engl J Med,2005
2. WHO Adherence to Long-term Therapies: Evidence for Action http://www.who.int/chp/knowledge/publications/adherence_report/en/
3. Pew Research Center Smartphone Ownership-2013 Update http://www.pewinternet.org/files/old-media//Files/Reports/2013/PIP_Smartphone_adoption_2013_PDF.pdf
4. Barret LL Health and Caregiving Among the 50+: Ownership, Use, and Interest in Mobile Technology - health-caregiving-mobile-technology.pdf http://assets.aarp.org/rgcenter/general/health-caregiving-mobile-technology.pdf
5. Heterogeneous mobile phone ownership and usage patterns in Kenya;Wesolowski;PLoS ONE,2012