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Astbury S, Costa Nunes Soares MM, Peprah E, et al. Nanopore sequencing from extraction-free direct PCR of dried serum spots for portable hepatitis B virus drug-resistance typing published online ahead of print, 2020 Jun 2. J Clin Virol. 2020;129:104483. doi:10.1016/j.jcv.2020.104483