Serum ferritin and vitamin D levels in premature hair graying of college student at the Universitas Sumatera Utara area

[摘要] Premature hair graying (PHG) is defined as a person has five gray hairs and

[发布机构] Department of Anatomy, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia^1;Department of Biochemistry, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia^2

[关键词] Blood samples;College students;Cross-sectional study;Distribution patterns;ELISA methods;Environmental factors;Genetic factors;Skin pigmentation