Anggraini, Dwi Rita, Lita Feriyawati, Mega Sari Sitorus, and Siti Syarifah. 2022. “Analysis of Zinc and Copper Serum Levels in Premature Hair Graying at Young Age”. Open Access Macedonian Journal of Medical Sciences 10 (A):283-86. https://doi.org/10.3889/oamjms.2022.8383.