Comparative effectiveness of immediate antiretroviral therapy versus CD4-based initiation in HIV-positive individuals in high-income countries: observational cohort study - Lodi, Sara; Phillips, Andrew; Logan, Roger; Olson, Ashley; Costagliola, Dominique; Abgrall, Sophie; van Sighem, Ard; Reiss, Peter; Miro, Jose M; Ferrer, Elena; others (The lancet HIV, 2015)