J D Weigel1, M Egal2, J Bakker2,3,4. 1. Department of Intensive Care, Erasmus Medical Center Rotterdam, 's Gravendijkwal 230, Room H611, 3015 CE, Rotterdam, The Netherlands. j.weigel@erasmusmc.nl. 2. Department of Intensive Care, Erasmus Medical Center Rotterdam, 's Gravendijkwal 230, Room H611, 3015 CE, Rotterdam, The Netherlands. 3. Department of Intensive Care, School of Medicine, Pontifical Catholic University of Chile, Santiago, Chile. 4. Department of Pulmonology and Critical Care, Columbia University College of Physicians and Surgeons, New York, USA.