Analisis Asosiasi Single Nucleotide Polymorphism (SNP) rs2476601 Gen Protein Tyrosine Phosphatase Non-Receptor Type 22 (PTPN22) dengan Alopecia Areata pada Populasi Indonesia = Analysis of Association between Single Nucleotide Polymorphism (SNP) rs2476601 Protein Tyrosine Phosphatase Non-Receptor Type 22 (PTPN22) Gene and Alopecia Areata on Indonesian Population