1 From the Department of Cardiothoracic Surgery, University Medical Centre Utrecht, Utrecht (PK), Department of Anaesthesiology (PK, JBB), Department of Internal medicine, Gelderse Vallei Hospital (RHHB, PK, SB), Thrombosis service Neder-Veluwe, Ede (RvL) and Department of Medical Oncology, Erasmus Medical Centre Cancer Institute, Rotterdam, the Netherlands (SB).