Owing to a very large diffusion worldwide, about 93% of
world population (Fig. 2) are smartphone users [4].
However, there are also common diseases diffused around
the world, Fig. 3, which can be prevented or better treated
through continuous and ubiquitous health monitoring by
the smartphone.
Europe has the highest median age in the world, where
about 20% of the population is aged 65 and older.
Smartphone is a great support for ensuring a safe
environment and quality of life improvement by
monitoring diseases related to the musculoskeletal system
and fall detection for the elderly.
A 2014 report of the American Heart Association [5]
estimated the mortality risk of the population due to high
blood pressure at about 41%. Daily monitoring of the heart
Fig.