[sup 99m] Tc-ECD brain perfusion SPET: variability, asymmetry and effects of age and gender in healthy adults. - Van Laere, Koenraad; Versijpt, Jan; Audenaert, Kurt; Koole, Michel; Goethals, Ingeborg; Achten, Erik; Dierckx, Rudi (European Journal of Nuclear Medicine, 2001)