Manullang, Frenky Sorimuda, Adlin Adnan, and Delfitri Munir. 2021. “Factors Affecting Presbycusis on Audiogram Overview at H. Adam Malik General Hospital Medan”. Journal of Epidemiology and Public Health 6 (1):12-20. https://jepublichealth.com/index.php/jepublichealth/article/view/362.