Khairuni, Raisa, Nelva Karmila Jusuf, and Imam Budi Putra. “The Relationship of the Use of Masks With the Event of Maskne on Universitas Sumatera Utara Hospital Healthcare Workers During the COVID-19 Pandemic”. Bali Medical Journal 12, no. 2 (April 12, 2023): 1171–1174. Accessed September 26, 2023. https://balimedicaljournal.org/index.php/bmj/article/view/3967.