Correlation of Stress Levels and the Incidence of Pityriasis Sicca in Final Year Students of the Faculty of Medicine, Universitas Sumatera Utara Class of 2017. Sumat. Med. J. [Internet]. 2021Apr.20 [cited 2024Apr.27];4(2). Available from: https://talenta.usu.ac.id/smj/article/view/5775