Vaseghi, Salar, Cognitive and Neuroscience Research Center (CNRC), Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran). P.O. Box: 13145-784, Tel: +9821-99881118-20, Fax: +9821-99881117, E-mail: salarv67@yahoo.com, Iran, Islamic Republic of