Ledergerber, Bruno, Jens D. Lundgren, Sarah A. Walker, Caroline Sabin, Amy Justice, Peter Reiss, Cristina Mussini, Ferdinand Wit, Antonella d'Arminio Monforte, Rainer Weber et al. "Predictors of trend in CD4-positive T-cell count and mortality among HIV-1-infected individuals with virological failure to all three antiretroviral-drug classes." Lancet 364, no. 9428 (2004): 51-62.