Butool, Fouqiya, Amanullah Mohammed, Parween Ali Syed, and Rasheed Abdul Mohammed. 2019. “Role of Serum Zinc and Copper Levels in Patients With Acne Vulgaris”. Journal of Orofacial Research 8 (4): 71-75. https://www.mansapublishers.com/jofr/article/view/1818.