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://doi.org/10.26911/jepublichealth.2021.06.01.02.