1 Division of Pulmonary and Critical Care Medicine, Harborview Medical Center, University of Washington, 325 Ninth Avenue, Box 359762, Seattle, WA, 98104, USA. along11@uw.edu.
2 Department of Intensive Care Medicine, Gelre Hospitals, Apeldoorn Location, Apeldoorn, The Netherlands.
3 Department of Anesthesiology and Critical Care Medicine, Hadassah Hebrew University Medical Center, Jerusalem, Israel.