1. Projection of the Japanese population by major age group. Technical report. http://www.ipss.go.jp/p-info/e/S_D_I/Indip.asp#t_3 . Accessed 18 May 2016
2. The Wall Street Journal. http://blogs.wsj.com/japanrealtime/2015/06/16/fear-of-dying-alone-the-state-of-japans-aging-population/ . Accessed 18 May 2015
3. Boulos, M.N.K., Wheeler, S., Travers, C., Jones, R.: How smartphones are changing the face of mobile participatory healthcare an overview with example from eCAALYX. Biomed. Eng. 10(1), 1 (2011)
4. Why Robots Are the Future of Elder Care. https://www.good.is/articles/robots-elder-care-pepper-exoskeletons-japan . Accessed 18 May 2016
5. Older Adults and Technology Use. http://www.pewinternet.org/2014/04/03/older-adults-and-technology-use/ . Accessed 18 May 2016