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LITERATURE CITED

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    Andrew NP, Jens DL. The CD4 lymphocyte count and risk of clinical progression. Curr Opin HIV AIDS 2006;1:4349.
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    Panel on Antiretroviral Guidelines for Adults and Adolescents.Guidelines for the use of antiretroviral agents in HIV-1-infected adults and adolescents.Department of Health and Human Services. Available at http://aidsinfo.nih.gov/contentfiles/lvguidelines/AdultandAdolescentGL.pdf Section accessed 01/10/2012.
  • 3
    World Health Organization.Antiretroviral therapy for HIV infection in adults and adolescents.Geneva:WHO,2010.
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    Nelson M, Dockrell DH, Edwards S on behalf of the BHIVA Guidelines Subcommittee. British HIV Association and British Infection Association guidelines for the treatment of opportunistic infection in HIV-seropositive individuals 2011. HIV Med 2011;12 ( Suppl 2):15.
  • 5
    European AIDS Clinical Society.Guidelines. Version 6- October2011.
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    Higgins J, Hill V, Lau K, Simpson V, Roayaei J, Klabansky R, Stevens RA, Metcalf JA, Baseler M. Evaluation of a single platform technology for lymphocyte immunophenotyping. Clin Vaccine Immunol 2007;14:13421348.
  • 7
    Barnett D, Granger V, Whitby L, Storie I, Reilly JT. Absolute CD4+ T-Lymphocyte and CD34+ stem cell counts by single platform flow cytometry: The way forward. BJH 1999;106:10591062.
  • 8
    Robinson G, Morgan L, Evans M, McDermott S, Pereira S, Wansbrough-Jones M, Griffin G. Effect of type of haematology analyser on CD4 count. Lancet 1992;340:485.
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    Connelly MC, Knight M, Giorgi JV, Kagan J, Landay AL, Parker JW, Page E, Spino C, Wilkening C, Mercolino TJ. Standardization of absolute CD4+ lymphocyte counts across laboratories: An evaluation of the ortho CytoronAbsolute flow cytometry system on normal donors. Cytometry 1995;22:200210.
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    Schnizlein-Bick CT, Spritzler J, Wilkening CL, Nicholson JKA, O'Gorman MRG. Evaluation of TruCount absolute-count tubes for determining CD4 and CD8 cell numbers in human immunodeficiency virus positive adults. Clin Diagn Lab Immunol 2000;7:336343.
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    Reimann KA, O'Gorman MRG, Spritzler J, Wilkening CL, Sabath DE, Helm K, Campbell DE. Multisite comparison of CD4 and CD8 T-lymphocyte counting by single- versus multiple-platform methodologies: Evaluation of Beckman Coulter flow-count fluorosperes and the tetraONE system. Clin Diagn Lab Immunol 2000;7:344351.
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    Kunkl A, Risso D, Terranova MP, Girotto M, Brando B, Mortara L, Lantieri PB. Grading of laboratories on CD4+ T-lymphocyte evaluations based on acceptable data boundaries defined by the measurement error. Cytometry 2002;50:117126.
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    Barnett D, Granger V, Mayr P, Storie I, Wilson GA, Reilly JT. Evaluation of a novel stable whole blood quality control material for lymphocyte subset analysis: Results from the UK NEQAS immune monitoring scheme. Cytomtery 1996;26:216222.
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    Whitby L, Granger V, Storie I, Goodfellow K, Sawle A, Reilly JT, Barnett D. Quality control of CD4+ T-lymphocyte enumeration: Results from the last 9 years of the United Kingdom national external quality assessment scheme for immune monitoring (1993–2001). Cytometry 2002;50:102110.
  • 15
    Healy MJR. Outliers in clinical chemistry quality control schemes. Clin Chem 1979;25:675677.
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    Barnett D, Granger V, Kraan J, Whitby L, Reilly JT, Papa S, Gratama JW. Reduction of intra- and interlaboratory variation in CD34 stem cell enumeration by the use of stable test material, standard protocols and targeted training. Br J Haematol 2000;108:784792.