[1] European Inst Oncol IRCCS, Neuroendocrine Surg Tumor Unit, IEO, Milan, Italy
[2] European Inst Oncol IRCCS, Div Digest Surg, IEO, Milan, Italy
[3] European Inst Oncol IRCCS, Div Nucl Med, IEO, Milan, Italy
[4] Ist Nazl Fis Nucl INFN, Sez Roma, Rome, Italy
[5] European Inst Oncol IRCCS, Div Med Phys, IEO, Milan, Italy
[6] Univ Milano Bicocca, Dept Stat & Quantitat Methods, Milan, Italy
[7] European Inst Oncol IRCCS, Div Pathol, IEO, Milan, Italy
[8] Sapienza Univ Rome, Dept Basic & Appl Sci Engn, Rome, Italy
[9] European Inst Oncol IRCCS, Div Gastrointestinal & Neuroendocrine Tumors Med T, IEO, Milan, Italy
[10] Univ Statale Milano, Milan, Italy
[11] Univ Milan, Dept Oncol & Hemato Oncol, Milan, Italy