1. Department of Pathology, University of Texas Southwestern Medical Center, Dallas
2. Head & Neck Pathology, Joint Pathology Center, Silver Spring
3. Department of Pathology, University of Texas MD Anderson Cancer Center, Houston, TX
4. Department of Pathology, Mayo Clinic, Rochester, MN
5. Department of Pathology, Johns Hopkins Hospital, Baltimore, MD
6. Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY
7. Institute of Pathology, University Hospital, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany