1. IMEDIR Center, University of A Coruña, Campus de Elviña s/n, 15071 A Coruña, Spain
2. Department of Information and Communication Technologies, Computer Science Faculty, University of A Coruña, 15071 A Coruña, Spain
3. Service of Anesthesiology, Resuscitation and Intensive Care, Meixoeiro Hospital, Meixoeiro s/n, 32600 Vigo, Spain