Measurements of plasma metanephrines by immunoassay versus LC-MS/MS for diagnosis of pheochromocytoma - Weismann, D; Raida, A; Deutschbein, T; Prejbisz, A; Januszewicz, A; Willenberg, HS; Peitzsch, M; Därr, R; Klemm, R; Manz, G; Bidlingmaier, M; Eisenhofer, G; Fassnacht, M (Experimental and Clinical Endocrinology & Diabetes, 2014)