1 Instituto de Telecomunicações, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
2 Department of Electrical, Electronic, Telecommunications Engineering, and Naval Architecture (DITEN), University of Genoa, Via dell'Opera Pia 13, 16145 Genoa, Italy.
The demographic shift of the population toward an increased number of elder citizens, together with the sedentary lifestyle we are adopting, is reflected in the increasingly debilitated physical health of the population [...].