1. Department of Pathology, Stanford Medical Center, Stanford, CA, USA
2. Department of Pathology, Donostia University Hospital, San Sebastian, Spain
3. Dpartment of Pathology, Albany Medical Center, Albany, NY, USA
4. Department of Pathology, Hospital Universitario de A Coruna, A Coruna, Spain
5. Department of Pathology, Hospital Universitario de Navarra, Pamplona, Spain
6. Department of Pathology, Hospital General Universitario Gregorio Maranon, Madrid, Spain