[1] Tech Univ Munich, Dept Pathol, Consultat Ctr Pancreat & Endocrine Tumors, D-81675 Munich, Germany
[2] UCSC Policlin A Gemelli, Inst Pathol, Rome, Italy
[3] Univ Bern, Inst Pathol, Bern, Switzerland
[4] Stadtspital Triemli, Inst Pathol, Zurich, Switzerland
[5] Mem Sloan Kettering Canc Ctr, Surg Pathol Serv, New York, NY 10021 USA