Effect of incident hepatitis C infection on CD4+ cell count and HIV RNA trajectories based on a multinational HIV seroconversion cohort by Van Santen, D, Van Der Helm, J, Touloumi, G, Pantazis, N, Muga, R, Gunsenheimer-Bartmeyer, B, Gill, M, Sanders, E, Kelleher, A, Zangerle, R, Porter, K, Prins, M, Geskus, R, Cascade Collaboration Within Eurocoord