1. Department of Anesthesiology, Infectious Diseases, University of Texas Medical Branch, Galveston, Texas.
2. Department of Internal Medicine, Infectious Diseases, University of Texas Medical Branch, Galveston, Texas.
3. Stanford University, Palo Alto, California.
4. Department of Internal Medicine, Brown Medical School, Providence, Rhode Island.
5. Center for Biomedical Engineering, University of Texas Medical Branch, Galveston, Texas.
6. Department of Bioengineering, Duke University, Durham, North Carolina.