1. Hospital Universitario de Canarias, University of La Laguna, La Laguna, Spain;
2. Department of Systems Engineering, University of La Laguna, La Laguna, Spain;
3. Weill Cornell Medical College, New York, New York;
4. Hospital Clinico San Carlos, University Complutense of Madrid, Madrid, Spain; and
5. Miguel Servet University Hospital, Aragon Health Sciences Institute, University of Zaragoza, Zaragoza, Spain.