Affiliation: | 1. Department of Pathology, Massachusetts General Hospital and Harvard Medical School, Boston 02114, MA;2. Department of Pathology, Poznan University Of Medical Sciences, Poznan 61-701, Poland;3. Department of Surgical Oncology, Massachusetts General Hospital and Harvard Medical School, Boston 02114, MA;4. Department of Orthopedic Oncology, Massachusetts General Hospital and Harvard Medical School, Boston 02114, MA |