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Serum levels of neutrophil gelatinase-associated lipocalin (NGAL) in virological responders (n = 26) and non-responders (n = 11) before (baseline) and at different time-points after initiating highly active anti-retroviral therapy (HAART). Data are mean ± standard deviation. The Wilcoxon-signed rank test was used for comparison of paired data during HAART. *P < 0·05 versus baseline levels.
