“…Some approaches have proposed the use of several sensors placed on different parts of the body [ 32 , 33 , 35 , 36 , 37 , 38 , 39 ], while recent approaches tend to use sensors placed on the wrist, fingers [ 40 , 41 , 42 , 43 ], foot [ 44 ], and smartphones with writs adapters or watch-like devices [ 45 , 46 , 47 , 48 , 49 , 50 ]. Also, these approaches have been used in companion with automatic classification algorithms [ 36 , 37 , 38 , 39 , 40 , 46 ], threshold approaches [ 51 , 52 , 53 , 54 , 55 ], and deep learning technics [ 15 , 49 , 50 , 56 ] to provide low cost and non-invasive solutions for remote monitoring [ 45 , 57 ].…”