“The Relationship Between Anxiety Level With the Onset of Acne Vulgaris in Medical Faculty of Universitas Sumatera Utara 2016 – 2018”. Sumatera Medical Journal 5, no. 2 (May 1, 2022). Accessed February 4, 2026. https://idjpcr.usu.ac.id/smj/article/view/7890.