1. Department of Radiology, Division of Thoracic Imaging and Intervention, Massachusetts General Hospital, Boston, MA
2. Department of Radiology, Ludwig-Maximilians-University, Munich, Germany
3. Department of Radiology, Massachusetts General Hospital, Boston, MA
4. Diagnostic and Interventional Radiology, University Hospital Zurich, University Zurich, Switzerland
5. Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Boston, MA