Influence of COMT Gene Polymorphism on fMRI-assessed Sustained and Transient Activity during a Working Memory Task. - Cindy M. de Frias; Petter Marklund; Elias Eriksson; Anne Larsson; Lena Öman; Kristina Annerbrink; Lars Bäckman; Lars-Göran Nilsson; Lars Nyberg (J. Cogn. Neurosci., 2010)