1. Department of Pathology and Laboratory Medicine; Temple University Hospital; Philadelphia Pennsylvania
2. Department of Pathology; Massachusetts General Hospital, Harvard University; Boston Massachusetts
3. Department of Anatomic Pathology and Histology; the Catholic University of Rome; Rome Italy
4. Department of Pathology; Division of Pathology and Laboratory Medicine, The University of Texas MD Anderson Cancer Center; Houston Texas
5. Department of Pathology; Geneva University Hospital; Geneva Switzerland
6. Institute of Pathology; University Hospital; Lausanne Switzerland