1. Department of Intensive Care, Haga Teaching Hospital , Els Borst-Eilersplein 275, The Hague 2545 AA , The Netherlands
2. Department of Cardiology, Haga Teaching Hospital , Els Borst-Eilersplein 275, The Hague 2545 AA , The Netherlands
3. Department of Cardiothoracic Surgery, Haga Teaching Hospital , The Hague , The Netherlands