1. Division of Aerospace Medicine, Department of Internal Medicine, Wright State University, Dayton, OH, USA
2. Division of Critical Care Medicine, Department of Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA
3. The University of Texas Medical Branch at Galveston, Galveston, TX, USA
4. University General Hospital, Houston, TX, USA
5. Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
6. University Vascular Associates, Los Angeles, CA, USA