[1] Case Western Reserve Univ, Sch Med, Div Med Educ, Cleveland, OH 44106 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Residency Training Program, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Dept Neurol, Los Angeles, CA 90095 USA