1. Department of Pathology and Laboratory Medicine (M.D., M.B.D., Y.E.N., M.N.N.), University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania 15213
2. Institute of Surgical Pathology (A.V., H.M.), University Hospital Zurich, 8091 Zurich, Switzerland
3. Institute of Surgical Pathology (P.K.), Triemlispital Zurich, 8063 Zurich, Switzerland
4. Institute of Pathology (A.P.), University of Bern, 3010 Bern, Switzerland