1. Reprints: Ronald J. Elin, MD, PhD, University of Louisville School of Medicine, 530 S Jackson St, C1R06, Louisville, KY 40202 (rjelin01@gwise.louisville.edu).
2. From the Department of Pathology and Laboratory Medicine, School of Medicine, University of Louisville, Louisville, Ky (Dr Elin), and Department of Pathology, Immunology and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, Fla (Dr Winter).