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3. Endocrine tumors of the gastrointestinal tract: part 11;Arnold;Best Practice Res Clin Gastroent,2005
4. Endocrine tumors of the gastrointestinal tract: part 1;Arnold;Best Practice Res Clin Gastroent,2005
5. Neuroendocrine tumors;Oberg;Best Pract Res Clin Endocrinol Metab,2007