Increased local and decreased remote functional connectivity at EEG alpha and beta frequency bands in opioid-dependent patients. - Fingelkurts, Andrew A.; Fingelkurts, Alexander A.; Kivisaari, Reetta; Autti, Taina; Borisov, Sergei; Puuskari, Varpu; Jokela, Olga; Kähkönen, Seppo (Psychopharmacology, 2006)