Department of Bioengineering, Faculty of Electrical Engineering, Havana Institute of Technology, Havana 19390, Cuba. luis_a_diago@yahoo.com|Department of Bioengineering, Faculty of Electrical Engineering, Havana Institute of Technology, Havana 19390, Cuba. luis_a_diago@yahoo.com|Department of Bioengineering, Faculty of Electrical Engineering, Havana Institute of Technology, Havana 19390, Cuba. luis_a_diago@yahoo.com|Department of Bioengineering, Faculty of Electrical Engineering, Havana Institute of Technology, Havana 19390, Cuba. luis_a_diago@yahoo.com