1. Department of Internal Medicine, University of Pittsburgh Medical Center, McKeesport Program, Pittsburgh, Pennsylvania;
2. Department of Pulmonary, Allergy and Critical Care, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania;
3. Center for Advanced Heart and Lung Disease, Baylor University Medical Center, Dallas, Texas;
4. Department of Dermatology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania;
5. Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania