mohammad yazdchi associate professor, department of neurology, tabriz university of medical sciences, tabriz, iran. zahra ghasemi resident, department of neurology, tabriz university of medical sciences, tabriz, iran hanieh moshayedi resident, department of neurology, tabriz university of medical sciences, tabriz, iran reza rikhtegar resident, department of neurology, tabriz university of medical sciences, tabriz, iran somayeh mostafayi resident, department of neurology, tabriz university of medical sciences, tabriz, iran hale mikailee associate professor, department of internal medicine, tabriz university of medical sciences, tabriz, iran

Johanna H van der Lee Leo D Roorda Heleen Beckerman Gustaaf J Lankhorst Lex M Bouter