1. Biomedical Engineering and Telemedicine Group, Biomedical Technology Centre CTB, ETSI Telecomunicación, Universidad Politécnica de Madrid, Madrid, Spain.
2. Department of Health Sciences, Universidad Técnica Particular de Loja (UTPL), Loja, Ecuador.
3. Research Group in Telecommunications Systems, GISTEL, Universidad Politécnica Salesiana, Guayaquil, Ecuador.
4. Department of Oncology, Hospital Eugenio Espejo, Quito, Ecuador.