In this stage the referrals were first enrolled and their identifications were registere admission application . Then the written informed consent, which is necessary to perform all of the stages, was taken from the referrals. According to the check list, the individuals were referred to other sections. When the complete identification information of the individuals were recorded. Furthermore, based on the set protocol 11-digit code under the title of Persian Cohort identification (PCID) was determined particularly for every individual.