The risk of AIDS-defining events is decreasing over time in the German HIV-1 Seroconverter Cohort. - Altmann, Mathias; an der Heiden, Matthias; Scheufele, Ramona; Hartmann, Katrin; Houareau, Claudia; Bartmeyer, Barbara; Hamouda, Osamah (BMC Infectious Diseases, 2012)