Up to the present day we have processed and analyzed data from approximately over 400 study centers worldwide. Of course, most of our sponsors have a number of preferred study centers with whom they have in many cases already collaborated for some time. The study centers selected by the sponsor need, however, to be qualified by means of our questionnaire that has to be filled in online. Thus we get the necessary information about scanners and software used, and also about the person in charge on site.