1. Department of Medicine and Department of Microbiology, New York University School of Medicine and Veteran's Administration Medical Center, New York, NY 10016
2. Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
3. Center for Genome Sciences, Washington University School of Medicine, St. Louis, MO 63110
4. Divison of Infectious Disease and Immunology, Department of Medicine, New York University School of Medicine and Bellevue Medical Center, New York, NY 10016