1. Department of Pathology, The Johns Hopkins Medical Institutions, Baltimore, Maryland, USA.
2. Department of Pathology and Laboratory Medicine, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania, USA.
3. Department of Pathology, Cochin Hospital, Paris, France.
4. Department of Pathology, Medical Faculty of Porto University, Porto, Portugal.
5. Department of Pathology, Medipath and the American Hospital of Paris, Paris, France.
6. Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA.