On October 1st of 2019, an online meeting was held with the primary investigator and managerial and executive members of the PERSIAN Birth Cohort. In this meeting, issues regarding quality assessment of the collected data and suggestions for the improvement of data quality were debated. Suggested protocols were reviewed and clarifications of some parts of the protocols were done. The general status of bio banking procedure and number of participants were reported by each committee as well. In this meeting, topics for possible sub studies during the main project were also discussed.