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Gsponer, Thomas; Petersen, Maya; Egger, Matthias; Phiri, Sam; Maathuis, Marloes H; Boulle, Andrew; Musondad, Patrick; Tweya, Hannock; Peter, Karin; Chi, Benjamin H; Keiser, Olivia; IeDEA Southern Africa, (2012). The causal effect of switching to second-line ART in programmes without access to routine viral load monitoring. AIDS, 26(1), pp. 57-65. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1097/QAD.0b013e32834e1b5f
