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This is to certify that your paper entitled «Comparison of the Effective Reproduction Number (Rt) Estimation Methods of COVID-۱۹ Using Simulation Data Based on Available Data from Iran, USA, UK, India, and Brazil» was indexed with 9 pages, in the CIVILICA citation database, code COI:JR_JRHSU-22-3_003, after evaluation and approval of the referees of the "Journal of Research in Health Sciences Vol 22, Issue 3 , Year 2023.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above journal and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.