*Department of Pathology, University of Texas Southwestern Medical Center, Dallas

‡Department of Pathology, University of Texas MD Anderson Cancer Center, Houston, TX

†Head & Neck Pathology, Joint Pathology Center, Silver Spring

∥Department of Pathology, Johns Hopkins Hospital, Baltimore, MD

§Department of Pathology, Mayo Clinic, Rochester, MN

¶Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY

#Institute of Pathology, University Hospital, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany

Conflicts of Interest and Source of Funding: Funded by the Jane B. and Edwin P. Jenevein M.D Endowment for Pathology at UT Southwestern Medical Center. The authors have disclosed that they have no significant relationships with, or financial interest in, any commercial companies pertaining to this article.

Correspondence: Doreen N. Palsgrove, MD, Clements University Hospital, Suite UH04.234, 6201 Harry Hines Boulevard, Dallas, TX 75390 (e-mail: [email protected]).