[1] Department of Neurology,
[2] Tokyo Medical and Dental University,undefined
[3] 1-5-45,undefined
[4] Yushima,undefined
[5] Bunkyo-ku,undefined
[6] Tokyo 113-8519,undefined
[7] Japan e-mail: m-yamada.nuro@med.tmd.ac.jp Tel.: +81-3-58035234 Fax: +81-3-58030169,undefined