http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11459676&dopt=Abstract
Clin Neurophysiol 2001 Aug;112(8):1367-77
Wassermann EM, Lisanby SH.
Brain Stimulation Unit, National Institute of Neurological Disorders and Stroke, 10 Center Drive MSC 1428, Bethesda, MD 20892-1428, USA.