1 Department of Cardiac Surgery, Clinic University Hospital of Valladolid, Valladolid, Spain; BioCritic, Group for Biomedical Research in Critical Care Medicine, Valladolid, Spain.
2 BioCritic, Group for Biomedical Research in Critical Care Medicine, Valladolid, Spain; Anesthesiology and Critical Care, Clinic University Hospital of Valladolid, Valladolid, Spain.