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Huber, M; Ledergerber, B; Sauter, R; Young, J; Fehr, J; Cusini, A; Battegay, M; Calmy, A; Orasch, C; Nicca, D; Bernasconi, E; Jaccard, R; Held, L; Weber, R; Swiss HIV Cohort Study Group, (2012). Outcome of smoking cessation counselling of HIV-positive persons by HIV care physicians. HIV medicine, 13(7), pp. 387-397. Oxford: Blackwell Science 10.1111/j.1468-1293.2011.00984.x