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Absolute copy number and relative change in determinations of human immunodeficiency virus type 1 RNA in plasma: effect of an external standard on kit comparisons.
Brambilla D, Leung S, Lew J, Todd J, Herman S, Cronin M, Shapiro DE, Bremer J, Hanson C, Hillyer GV, McSherry GD, Sperling RS, Coombs RW, Reichelderfer PS. Brambilla D, et al. J Clin Microbiol. 1998 Jan;36(1):311-4. doi: 10.1128/JCM.36.1.311-314.1998. J Clin Microbiol. 1998. PMID: 9431977 Free PMC article.