1. Mariakakis, A., Wang, E., Goel, M., Patel, S.: Challenges in realizing smartphone-based health sensing. IEEE Pervasive Comput. 18(2), 76–84 (2019)
2. World Health Organization: mhealth: new horizons for health through mobile technologies: based on the findings of the second global survey on ehealth (2019). https://www.who.int/goe/publications/goemhealthweb.pdf. Accessed Jan 2020
3. Banga, B.: Global mobile medical apps market to reach usd11.22 billion by 2025, reports BIS research (2020). https://www.prnewswire.com/news-releases/. Accessed Aug 2020
4. Cosco, T.D., Firth, J., Vahia, I., Sixsmith, A., Torous, J.: Mobilizing mhealth data collection in older adults: challenges and opportunities. JMIR Aging 2(1), 1–8 (2019)
5. Elflein, J.: Hospital care expenditure in the united states from 1960 to 2020 (2020). https://www.statista.com/statistics/184772/us-hospital-care-expenditures-since-1960/. Accessed July 2020