Differential modulation of subcortical target and cortex during deep brain stimulation - Haslinger, B; Boecker, H; Buchel, C; Vesper, J; Tronnier, VM; Pfister, R; Alesch, F; Moringlane, JR; Krauss, JK; Conrad, B; Schwaiger, M; Ceballos-Baumann, AO (Neuroimage, 2003)