Philip T. Cagle, MD is Medical Director, Pulmonary Pathology, Department of Pathology and Genomic Medicine, The Methodist Hospital Research Institute, Houston, Texas; and Professor of Pathology and Laboratory Medicine, Weill Cornell Medical College of Cornell University, New York, New York.Timothy C. Allen, MD is Professor, Department of Pathology; and Director of Anatomic Pathology, The University of Texas Medical Branch, Galveston.