Plasma normetanephrines and metanephrines for detecting pheochromocytoma in von Hippel-Lindau disease and multiple neoplasia type 2. - Eisenhofer,G.; Lenders,J.; Linehan,W.M.; Walther,M.M.; Goldstein,D.S.; Kaiser,H.R. (N Engl J Med, 1999)