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Wilkens, H; Demertzis, S; König, J; Leitnaker, C K; Schäfers, H J; Sybrecht, G W (2000). Lung volume reduction surgery versus conservative treatment in severe emphysema. European respiratory journal, 6(16), pp. 1043-9. Sheffield, UK: European Respiratory Society 10.1034/j.1399-3003.2000.16f04.x