Plasma normetanephrine and metanephrine for detecting pheochromocytoma in von Hippel-Lindau disease and multiple endocrine neoplasia type 2. - Eisenhofer,E.; Lenders,J.WM.; Lineham,W.M.; Walther,M.M.; Goldstein,D.S.; Keiser,H.R. (New Engl J Med, 1999)