[Clinical drug investigations. Definition of terms].Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz. 2005 Apr; 48(4):397-400.BG
Implementation of the European Directive 2001/20/EC led to the inclusion of definitions for clinical trial and non-interventional trial in German Drug Law. Other terms, such as non-commercial clinical trial, single patient use, post marketing surveillance and public health study are less well defined. This article explains the various terms by comparing their differences and similarities.