When to start antiretroviral therapy in children aged 2-5 years: a collaborative causal modelling analysis of cohort studies from southern Africa. oleh Michael Schomaker, Matthias Egger, James Ndirangu, Sam Phiri, Harry Moultrie, Karl Technau, Vivian Cox, Janet Giddy, Cleophas Chimbetete, Robin Wood, Thomas Gsponer, Carolyn Bolton Moore, Helena Rabie, Brian Eley, Lulu Muhe, Martina Penazzato, Shaffiq Essajee, Olivia Keiser, Mary-Ann Davies, International Epidemiologic Databases to Evaluate AIDS–Southern Africa (IeDEA-SA) Collaboration