Concorde: MRC/ANRS randomised double-blind controlled trial of immediate and deferred zidovudine in symptom-free HIV infection. Concorde Coordinating Committee. af Seligmann, M, Warrell, D, Aboulker, J, Carbon, C, Darbyshire, J, Dormont, J, Eschwege, E, Girling, D, James, D, Levy, J, Peto, T, Schwarz, D, Stone, A, Weller, I, Withnall, R, Gelmon, K, Lafon, E, Swart, A, Aber, V, Babiker, A, Lhoro, S, Nunn, A, Vray, M