Decline of CD4+ T-cell count before start of therapy and immunological response to treatment in antiretroviral-naive individuals - Mussini, Cristina; Cossarizza, Andrea; Sabin, Caroline; Babiker, Abdel; de Luca, Andrea; Bucher, Heiner C; Fisher, Martin; Rezza, Giovanni; Porter, Kholoud; Dorrucci, Maria; others (Aids, 2011)