Salsabila, V., and C. P. Hazlianda. “The Relationship Between Anxiety Level With the Onset of Acne Vulgaris in Medical Faculty of Universitas Sumatera Utara 2016 – 2018”. Sumatera Medical Journal, vol. 5, no. 2, May 2022, doi:10.32734/sumej.v5i2.7890.