Nova Zairina Lubis, and Hening Yumi Wardoyo Putri. “Level of Knowledge Among Medical Student Regarding The Role of Vitamin C For Skin Health in Universitas Sumatera Utara”. Sumatera Medical Journal 5, no. 1 (November 10, 2022). Accessed November 16, 2024. https://talenta.usu.ac.id/smj/article/view/6514.