GenotypePolymorphism, GeneticPolymorphism, Single NucleotideAllelesGene FrequencyGenetic Predisposition to DiseaseGenetic VariationPolymerase Chain ReactionPhylogenySequence Analysis, DNACase-Control StudiesPolymorphism, Restriction Fragment LengthPhenotypeHepacivirusHaplotypesMolecular Sequence DataHomozygote