1. Department of Medicine, Section of Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030, USA.
2. Department of Immunology, Baylor College of Medicine, Houston, TX 77030, USA.
3. Department of Pathology, Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX 77030, USA.
4. Department of Radiology, Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX 77030, USA.
5. Department of Surgery, Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX 77030, USA.
6. Department of Surgery, Baylor College of Medicine, Houston, TX 77030, USA.
7. Department of Radiology, Vancouver General Hospital, Vancouver, British Columbia, Canada V6Z 1Y6.
8. The Methodist Hospital, Houston, TX 77030, USA.
9. Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.