Anggraini, D.R., Feriyawati, L., Sitorus, M.S. and Syarifah, S. 2022. Analysis of Zinc and Copper Serum Levels in Premature Hair Graying at Young Age. Open Access Macedonian Journal of Medical Sciences. 10, A (Feb. 2022), 283–286. DOI:https://doi.org/10.3889/oamjms.2022.8383.