[1] Beth Israel Deaconess Med Ctr, Dept Neurol, Boston, MA 02215 USA
[2] Harvard Univ, Sch Med, Boston, MA 02215 USA
[3] Hanover Univ Mus & Drama, Inst Mus Physiol & Musicians Med, D-30161 Hannover, Germany
[4] Hannover Med Sch, Neurol Klin, D-30625 Hannover, Germany
[5] Otto Von Guericke Univ, Klin Neurol 2, Magdeburg, Germany