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G. L. Colombo, E. Agabiti-Rosei, A. Margonato, C. Mencacci, C.M. Montecucco, R. Trevisan. Off-patent generic medicines vs. off-patent brand medicines for six reference drugs: a retrospective claims data study from five local healthcare units in the Lombardy Region of Italy. PLOS ONE, Vol. 8, Issue 12, 2013.