1. Department of Electronic Technology, University of the Basque Country, Eibar, Spain
2. University of the Basque Country, Bilbao, Spain
3. Universidade Portucalense Infante D. Henrique, Porto, Portugal
4. INESC TEC, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
5. Department of Biomedical Informatics, School of Medicine, Emory University, Atlanta, GA, USA