Direct comparison of 18F-FDG and 11C-methionine PET in suspected recurrence of glioma: sensitivity, inter-observer variability and prognostic value. - Van Laere,K.; Ceyssens,S.; Van Calenbergh,F.; de Groot,T.; Menten,J.; Flamen,P.; Bormans,G.; Mortelmans,L. (Eur J Nucl Med Mol Imaging, 2005)