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Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz|March 25, 2009
[The German Clinical Trials Register: reasons, general and technical aspects, international integration]G Dreier, H Hasselblatt, G Antes, et al.Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz|April 4, 2009
[Clinical trials registers. Introduction to the topic and backgrounds]G Antes, G Dreier, H Hasselblatt, et al.Pageof 1