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Grimsrud, Anna Thora; Cornell, Morna; Egger, Matthias; Boulle, Andrew; Myer, Landon (2013). Impact of definitions of loss to follow-up (LTFU) in antiretroviral therapy program evaluation: variation in the definition can have an appreciable impact on estimated proportions of LTFU. Journal of clinical epidemiology, 66(9), pp. 1006-1013. New York, N.Y.: Elsevier 10.1016/j.jclinepi.2013.03.013
