1. Reprints: Yulia Gray, MD, Department of Pathology, Roger Williams Medical Center, 825 Chalkstone Ave, Providence, RI 02908.
2. From the Department of Pathology, Rhode Island Hospital and Brown University School of Medicine, Providence, RI (Dr Gray), and Department of Pathology, Roger Williams Medical Center, Providence, RI, and Boston University School of Medicine, Boston, Mass (Dr Libbey).