The North American Neuroendocrine Tumor Society consensus guideline for the diagnosis and management of neuroendocrine tumors: pheochromocytoma, paraganglioma, and medullary thyroid cancer - Chen, H; Sippel, R S; O’Dorisio, M S; Vinik, A I; Lloyd, R V; Pacak, KNorth American Neuroendocrine Tumor Society (NANETS) (Pancreas, 2010)