1. Intensive Care and Department of Respiratory Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
2. Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York
3. Center for Acute Respiratory Failure, New York-Presbyterian Hospital, New York, New York
4. Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Department of Medicine, University of California, San Francisco
5. Department of Anesthesia and Perioperative Care, University of California, San Francisco