Allele frequencies and genotype distributions were compared
between the patients and controls using chi square
test. For HLA-B, DRB1 and DPB1 loci, P values were corrected
for multiple comparisons; the corrected P value (Pc)
was calculated by multiplying the P value by the number of
alleles presented in each locus in the tested panels (27 for
B, 12 for DPB1 and 20 for DRB1). A Pc value of <0.05 was

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