1. Division of Anatomic Pathology and Histology, Agostino Gemelli School of Medicine; Catholic University of the Sacred Heart; Rome Italy
2. Department of Pathology; Massachusetts General Hospital, Harvard Medical School; Boston Massachusetts
3. Department of Pathology and Laboratory Medicine; Hospital of the University of Pennsylvania; Philadelphia Pennsylvania
4. Department of Pathology; Loyola University; Chicago Illinois
5. Department of Biomedical and Neuromotor Sciences, Unit of Anatomic Pathology; University of Bologna, Bellaria Hospital; Bologna Italy
6. Division of Clinical Pathology; Geneva University Hospital; Geneva Switzerland
7. National Health Laboratory; Dudelange Luxembourg
8. Department of Pathology and Laboratory Medicine, Wisconsin State Laboratory of Hygiene; University of Wisconsin School of Medicine and Public Health; Madison Wisconsin