1 Department of Cardiac Surgery, Clinical 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; Department of Anesthesiology and Critical Care, Clinical University Hospital of Valladolid, Valladolid, Spain.