16S rDNA gene 1 Article 1 Case-Control Studies 1 DNA Methylation 1 DNA extraction 1 DNA extraction method 1 DNA isolation 1 DNA methylation 1 DNA purification 1 DNA sequencing 1 DNA, Viral 1 Epstein Barr virus 1 Epstein Barr virus infection 1 Epstein-Barr Virus Infections 1 Feces 1 HLA DP antigen 1 HLA DPB1 gene 1 HLA-DP beta-Chains HLA-DPB1 antigen 1 Herpesvirus 4, Human 1 Humans 1 Liquid Biopsy 1 Nasopharyngeal Neoplasms 1 Polymerase Chain Reaction 1 Q-PCR 1 RNA 16S 1 RNA, Ribosomal, 16S 1 Saliva 1 Specimen Handling 1 adult 1