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12 - Giaccone G, Dalesio O, McVie GJ, Kirkpatrick A, Postmus PE, Burghouts JT, Bakker W, Koolen MG, Vendrik CP, Roozendaal KJ, .: Maintenance chemotherapy in small-cell lung cancer: long-term results of a randomized trial. European Organization for Research and Treatment of Cancer Lung Cancer Cooperative Group. J Clin Oncol 1993; 11(7):1230-1240.