1. Yale University School of Medicine, Section of Pulmonary and Critical Care Medicine, Department of Internal Medicine
2. Department of Pathology, New Haven, CT 06520
3. Pathology and Laboratory Medicine Service, VA-CT Health Care System, West Haven, CT 06516
4. Biogen, Inc., Cambridge, MA 02142
5. Washington University School of Medicine, Section of Pulmonary and Critical Care Medicine, Barnes-Jewish Hospital, St. Louis, MO 63110