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The Pattern of Attrition from an Antiretroviral Treatment Program in Nigeria
Figure 1
Kaplan-Meier curve showing retention in care for 24 months in secondary and tertiary facilities.
(Breslow-Gehan test χ2 = 24.4; p<0.001).
doi: https://doi.org/10.1371/journal.pone.0051254.g001