*Department of Pathology and Laboratory Medicine, University of Pennsylvania Perelman, School of Medicine, Philadelphia, PA

†Department of Pathology, Cleveland Clinic, Cleveland, OH

The authors have no funding or conflicts of interest to disclose.

Reprints: Zhaohai Yang, MD, PhD, Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, 3400 Spruce Street, 6 Founders, Philadelphia, PA 19104 (e-mail: [email protected]).

All figures can be viewed online in color at www.anatomicpathology.com.